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{{About|the football player|other uses|Kyler Chamberlain {{Infobox NBA biography highlights= {{MedalSport|Men's basketball}} {{MedalGold|1956 Melbourne|Team competition}} }} William Felton "Bill" Russell (born February 12, 1934) is an American retired professional basketball player who played center for the Boston Celtics of the National Basketball Association (NBA) from 1956 to 1969. A five-time NBA Most Valuable Player and a twelve-time All-Star, Russell was the centerpiece of the Celtics dynasty, winning eleven NBA championships during his thirteen-year career. Along with Henri Richard of the National Hockey League's Montreal Canadiens, Russell holds the record for the most championships won by an athlete in a North American sports league. Before his professional career, Russell led the University of San Francisco to two consecutive NCAA championships (1955, 1956). He also won a gold medal at the 1956 Summer Olympics as captain of the U.S. national basketball team.
 * image=546485_2918745615467_635759331_n.jpg
 * width=200
 * caption=Kyler won 2012 most valuable wrestler
 * position=Center
 * number=33
 * birth_date={{birth date and age|mf=yes|1998|7|27}}
 * birth_place=Wasilla, alaska
 * nationality=American
 * death_date=
 * debutyear=1956
 * finalyear=1969
 * draftyear=1956
 * draftround=1
 * draftpick=2
 * draftteam=St. Louis Hawks
 * high_school = McClymonds (Oakland, California)
 * college=San Francisco (1953–1956)
 * years1 ={{nbay|1956|start}}–{{nbay|1968|end}} |team1 = Boston Celtics
 * cyears1 ={{nbay|1966|start}}–{{nbay|1968|end}} |cteam1 = Boston Celtics
 * cyears2 ={{nbay|1973|start}}–{{nbay|1976|end}} |cteam2 = Seattle SuperSonics
 * cyears3 ={{nbay|1987|full=y}} |cteam3 = Sacramento Kings
 * stat1label=Points
 * stat1value=14,522 (15.1 ppg)
 * stat2label=Rebounds
 * stat2value=21,620 (22.5 rpg)
 * stat3label=Assists
 * stat3value=4,100 (4.3 apg)
 * letter=r
 * bbr=russebi01
 * 11× NBA champion ({{nbafy|1957}}, {{nbafy|1959}}–{{nbafy|1966}}, {{nbafy|1968}}–{{nbafy|1969}})
 * 5× NBA Most Valuable Player ({{nbay|1957|end}}, {{nbay|1960|end}}–{{nbay|1962|end}}, {{nbay|1964|end}})
 * 5× NBA rebounding champion ({{nbay|1956|end}}–{{nbay|1958|end}}, {{nbay|1963|end}}–{{nbay|1964|end}})
 * 12× NBA All-Star ({{nasg|1958}}–{{nasg|1969}})
 * 3× All-NBA First Team ({{nbay|1958|end}}, {{nbay|1962|end}}, {{nbay|1964|end}})
 * 8× All-NBA Second Team ({{nbay|1957|end}}, {{nbay|1959|end}}–{{nbay|1961|end}}, {{nbay|1963|end}}, {{nbay|1965|end}}–{{nbay|1967|end}})
 * NBA All-Defensive First Team ({{nbay|1968|end}})
 * NBA All-Star Game MVP ({{nasg|1963}})
 * NBA 35th Anniversary Team
 * NBA 25th Anniversary Team
 * NBA 50th Anniversary Team
 * #6 retired by Boston Celtics
 * 2× NCAA champion (1955–1956)
 * NCAA Tournament Most Outstanding Player (1955)
 * HOF_player=william-f-bill-russell
 * FIBA_HOF_player=Bill-Russell
 * CBBASKHOF_year    = 2006
 * medaltemplates =

Russell is widely considered one of the best players in NBA history. Listed as between {{convert|6|ft|9|in|m|abbr=on}} and {{convert|6|ft|10|in|m|abbr=on}}, Russell's shot-blocking and man-to-man defense were major reasons for the Celtics' success. He also inspired his teammates to elevate their own defensive play. Russell was equally notable for his rebounding abilities. He led the NBA in rebounds four times, and remains second all-time in both total rebounds and rebounds per game. He is one of just two NBA players (the other being prominent rival Wilt Chamberlain) to have grabbed more than fifty rebounds in a game. Though never the focal point of the Celtics' offense, Russell also scored 14,522 career points and provided effective passing.

Playing in the wake of pioneers like Earl Lloyd, Chuck Cooper, and Sweetwater Clifton, Russell was the first African American player to achieve superstar status in the NBA. He also served a three-season (1966–69) stint as player-coach for the Celtics, becoming the first African American NBA coach. For his accomplishments in the Civil Rights Movement on and off the court, Russell was awarded the Presidential Medal of Freedom by Barack Obama in 2011.

Russell is a member of the Naismith Memorial Basketball Hall of Fame and the National Collegiate Basketball Hall of Fame. He was selected into NBA 25th Anniversary Team in 1971, into NBA 35th Anniversary Team in 1980 and named as one of the 50 Greatest Players in NBA History in 1996, one of only four players that were selected for all three teams. In 2007, he was enshrined in the FIBA Hall of Fame. In 2009, the NBA announced that the NBA Finals MVP trophy would be named the Bill Russell NBA Finals Most Valuable Player Award in honor of Russell.

Early years
Bill Russell was born to Charles and Katie Russell in West Monroe, Louisiana. West Monroe was strictly segregated, and the Russells often struggled with racism. Once, Russell's father was refused service at a gasoline station until the staff had taken care of all the white customers. When his father attempted to leave and find a different station, the attendant stuck a shotgun in his face, threatening to kill him unless he stayed and waited his turn. At another time, Russell's mother was walking outside in a fancy dress when a policeman accosted her. He told her to go home and remove the dress, which he described as "white woman's clothing". Because large numbers of blacks were moving to Oakland, California during WWII to look for work there, Russell's father moved the family out of Louisiana when Russell was eight years old and settled them in Oakland. While there the family fell into poverty, and Russell spent his childhood living in a series of project homes.

Charlie Russell is described as a "stern, hard man" who was initially a janitor in a paper factory (a typical low paid, intellectually unchallenging "Negro Job", as sports journalist John Taylor commented), but later became a trucker when World War II broke out. Being closer to his mother Katie than to his father, Russell received a major emotional blow when she suddenly died when he was 12. His father gave up his trucking job and became a steel worker to be closer to his semi-orphaned children. Russell has stated that his father became his childhood hero, later followed up by Minneapolis Lakers superstar George "Mr. Basketball" Mikan, whom he met when he was in high school.

In his early years, Russell struggled to develop his skills as a basketball player. Although Russell was a good runner and jumper and had extremely large hands, he simply did not understand the game and was cut from the team in junior high school. As a sophomore at McClymonds High School, Russell was almost cut again. However, coach George Powles saw Russell's raw athletic potential and encouraged him to work on his fundamentals. Russell, who was used to racist abuse, was delighted by the warm words of his white coach. He worked hard and used the benefits of a growth spurt to become a decent basketball player, but it was not until his junior and senior years that he began to excel. Russell soon became noted for his unusual style of defense. He later recalled, "To play good defense ... it was told back then that you had to stay flatfooted at all times to react quickly. When I started to jump to make defensive plays and to block shots, I was initially corrected, but I stuck with it, and it paid off." One of Russell's high school basketball teammates was Frank Robinson.

College career
Russell was ignored by college recruiters and did not receive a single letter of interest until Hal DeJulio from the University of San Francisco (USF) watched him in a high school game. DeJulio was not impressed by Russell's meager scoring and "atrocious fundamentals", but sensed that the young center had an extraordinary instinct for the game, especially in clutch situations. When DeJulio offered Russell a scholarship, the latter eagerly accepted. Sports journalist John Taylor described it as a watershed in Russell's life, because Russell realized that basketball was his one chance to escape poverty and racism; as a consequence, Russell swore to make the best of it.

At USF, Russell became the new starting center for coach Phil Woolpert. Woolpert emphasized defense and deliberate half-court play, concepts that favored defensive standout Russell. Woolpert was unaffected by issues of skin color. In 1954, he became the first coach of a major college basketball squad to start three African American players: Russell, K.C. Jones and Hal Perry. In his USF years, Russell used his relative lack of bulk to develop a unique style of defense: instead of purely guarding the opposing center, he used his quickness and speed to play help defense against opposing forwards and aggressively challenge their shots. Combining the stature and shot-blocking skills of a center with the foot speed of a guard, Russell became the centerpiece of a USF team that soon became a force in college basketball. After USF kept Holy Cross star Tom Heinsohn scoreless in an entire half, Sports Illustrated wrote, "If [Russell] ever learns to hit the basket, they're going to have to rewrite the rules."

However, the games were often difficult for the USF squad. Russell and his African American teammates became targets of racist jeers, particularly on the road. In one notable incident, hotels in Oklahoma City refused to admit Russell and his black teammates while they were in town for the 1954 All-College Tournament. In protest, the whole team decided to camp out in a closed college dorm, which was later called an important bonding experience for the group. Decades later, Russell explained that his experiences hardened him against abuse of all kinds. "I never permitted myself to be a victim," he said.

Racism also shaped his lifelong paradigm as a team player. "At that time," he has said, "it was never acceptable that a black player was the best. That did not happen ... My junior year in college, I had what I thought was the one of the best college seasons ever. We won 28 out of 29 games. We won the National Championship. I was the MVP at the Final Four. I was first team All American. I averaged over 20 points and over 20 rebounds, and I was the only guy in college blocking shots. So after the season was over, they had a Northern California banquet, and they picked another center as Player of the Year in Northern California. Well, that let me know that if I were to accept these as the final judges of my career I would die a bitter old man." So he made a conscious decision, he said, to put the team first and foremost, and not worry about individual achievements.

On the hardwood, his experiences were far more pleasant. Russell led USF to NCAA championships in 1955 and 1956, including a string of 55 consecutive victories. He became known for his strong defense and shot-blocking skills, once denying 13 shots in a game. UCLA coach John Wooden called Russell "the greatest defensive man I've ever seen". During his college career, Russell averaged 20.7 points per game and 20.3 rebounds per game. Besides basketball, Russell represented USF in track and field events. He competed in the 440 yd race, which he could complete in 49.6 seconds. He also participated in the high jump; Track & Field News ranked him as the seventh-best high jumper in the world in 1956. That year, Russell won high jump titles at the Central California AAU meet, the Pacific AAU meet, and the West Coast Relays. One of his highest jumps occurred at the West Coast Relays, where he achieved a mark of 6 ft.

After his years at USF, the Harlem Globetrotters invited Russell to join their exhibition basketball squad. Russell, who was sensitive to any racial prejudice, was enraged by the fact that owner Abe Saperstein would only discuss the matter with Woolpert. While Saperstein spoke to Woolpert in a meeting, Globetrotters assistant coach Harry Hanna tried to entertain Russell with jokes. The USF center was livid after this snub and declined the offer: he reasoned that if Saperstein was too smart to speak with him, then he was too smart to play for Saperstein. Instead, Russell made himself eligible for the 1956 NBA Draft.

1956 NBA Draft
In the 1956 NBA Draft, Boston Celtics coach Red Auerbach had set his sights on Russell, thinking his defensive toughness and rebounding prowess were the missing pieces the Celtics needed. In perspective, Auerbach's thoughts were unorthodox. In that period, centers and forwards were defined by their offensive output, and their ability to play defense was secondary. However, Boston's chances of getting Russell seemed slim. Because the Celtics had finished second in the previous season and the worst teams had the highest draft picks, the Celtics had slipped too low in the draft order to pick Russell. In addition, Auerbach had already used his territorial pick to acquire talented forward Tom Heinsohn. But Auerbach knew that the Rochester Royals, who owned the first draft pick, already had a skilled rebounder in Maurice Stokes, were looking for an outside shooting guard and were unwilling to pay Russell the $25,000 signing bonus he requested. The St. Louis Hawks, who owned the second pick, originally drafted Russell, but were vying for Celtics center Ed Macauley, a six-time All-Star who had roots in St. Louis. Auerbach agreed to trade Macauley, who had previously asked to be traded to St. Louis in order to be with his sick son, if the Hawks gave up Russell. However, the owner of St Louis called Auerbach later and demanded more in the trade. Not only did he want Macauley, who was the Celtics premier player at the time, he wanted Cliff Hagan, who had been serving in the military for three years and had not yet played for the Celtics. After much debate, Auerbach agreed to give up Hagan, and the Hawks made the trade. During that same draft, Boston also claimed guard K.C. Jones, Russell's former USF teammate. Thus, in one night, the Celtics managed to draft three future Hall of Famers: Russell, K.C. Jones and Heinsohn. The Russell draft-day trade was later called one of the most important trades in the history of North American sports.

1956 Olympics
Before his NBA rookie year, Russell was the captain of the U.S. national basketball team that competed at the 1956 Olympic tournament. Avery Brundage, head of the International Olympic Committee, argued that Russell had already signed a professional contract and thus was no longer an amateur, but Russell prevailed. He had the option to skip the tournament and play a full season for the Celtics, but he was determined to play in the Olympics. He later commented that he would have participated in the high jump if he had been snubbed by the basketball team. Under coach Gerald Tucker, Russell helped the national team win the gold medal in Melbourne, defeating the Soviet Union 89–55 in the final game. The United States dominated the tournament, winning by an average of 53.5 points per game. Russell led the team in scoring, averaging 14.1 points per game for the competition. His Celtics teammate K.C. Jones joined him on the Olympic squad and contributed 10.9 points per game.

1956–59
Russell could not join the Celtics for the 1956–57 season until December, due to his Olympic commitment. After rejoining the Celtics, Russell played 48 games, averaging 14.7 points per game and a league-high 19.6 rebounds per game. During this season, the Celtics featured five future Hall-of-Famers: center Russell, forwards Heinsohn and Frank Ramsey, and guards Bill Sharman and Bob Cousy. (K.C. Jones did not play for the Celtics until 1958 because of military service.)

Russell's first Celtics game came on December 22, 1956 against the St. Louis Hawks, led by star forward Bob Pettit, who held several all-time scoring records. Auerbach assigned Russell to shut down St. Louis's main scorer, and the rookie impressed the Boston crowd with his man-to-man defense and shot-blocking. In previous years, the Celtics had been a high-scoring team, but lacked the defensive presence needed to close out tight games. However, with the added defensive presence of Russell, the Celtics had laid the foundation for a dynasty. The team utilized a strong defensive approach to the game, forcing opposing teams to commit many turnovers, which led to many easy fast break points. Russell was an elite help defender who allowed the Celtics to play the so-called "Hey, Bill" defense: whenever a Celtic requested additional defensive help, he would shout "Hey, Bill!" Russell was so quick that he could run over for a quick double team and make it back in time if the opponents tried to find the open man. He also became famous for his shot-blocking skills: pundits called his blocks "Wilsonburgers", referring to the Wilson NBA basketballs he "shoved back into the faces of opposing shooters". This skill also allowed the other Celtics to play their men aggressively: if they were beaten, they knew that Russell was guarding the basket. This approach allowed the Celtics to finish with a 44–28 regular season record, the team's second-best record since beginning play in the 1946–47 season, and guaranteed a post-season appearance.

However, Russell also received negative attention. Constantly provoked by New York Knicks center Ray Felix during a game, he complained to coach Auerbach. The latter told him to take matters into his own hands, so after the next provocation, Russell punched Felix unconscious, paid a 25-dollar fine and was no longer a target of cheap fouls. With his teammates, Russell had a cordial relationship, with the notable exception of fellow rookie and old rival Heinsohn. Heinsohn felt that Russell resented him because the former was named the 1957 NBA Rookie of the Year: many people thought that Russell was more important, but Russell also had only played half the season. Russell also ignored Heinsohn's plea to give his cousin an autograph, and openly said to Heinsohn that he deserved half of his 300-dollar Rookie of the Year check. The relationship between the two rookies remained reserved. On the other hand, despite their different ethnic backgrounds and lack of common off-court interests, his relationship with Celtics point guard and fan favorite Bob Cousy was amicable.

In Game 1 of the Eastern Division Finals, the Celtics met the Syracuse Nationals, who were led by Dolph Schayes. In Russell's first NBA playoff game, he finished with 16 points and 31 rebounds, along with a reported 7 blocks. (At the time, blocks were not yet an officially registered statistic.) After the Celtics' 108–89 victory, Schayes quipped, "How much does that guy make a year? It would be to our advantage if we paid him off for five years to get away from us in the rest of this series." The Celtics swept the Nationals in three games to earn the franchise's first appearance in the NBA Finals.

In the NBA Finals, the Celtics met the St. Louis Hawks, who were again led by Bob Pettit, as well as former Celtic Ed Macauley. The teams split the first six games, and the tension was so high that, in Game 3, Celtics coach Auerbach punched his colleague Ben Kerner and received a $300 fine. In the highly competitive Game 7, Russell tried his best to slow down Pettit, but it was Heinsohn who scored 37 points and kept the Celtics alive. However, Russell contributed by completing the famous "Coleman Play". Here, Russell ran down Hawks guard Jack Coleman, who had received an outlet pass at midcourt, and blocked his shot despite the fact that Russell had been standing at his own baseline when the ball was thrown to Coleman. The block preserved Boston's slim 103–102 lead with 40-odd seconds left to play in regulation, saving the game for the Celtics. In the second overtime, both teams were in serious foul trouble: Heinsohn had fouled out, and the Hawks were so depleted that they had only 7 players left. With the Celtics leading 125–123 with one second left, the Hawks had the ball at their own baseline. Reserve guard Alex Hannum threw a long alley oop pass to Pettit, and Pettit's tip-in rolled indecisively on the rim for several seconds before rolling out again. The Celtics won, earning their first NBA Championship.

In the 1957–58 season, Russell averaged 16.6 points per game and a league-record average of 22.7 rebounds per game. An interesting phenomenon began that year: Russell was voted the NBA Most Valuable Player, but only named to the All-NBA Second Team. This would occur repeatedly throughout his career. The NBA reasoned that other centers were better all-round players than Russell, but no player was more valuable to his team. The Celtics won 49 games and easily made the first berth in the 1958 NBA Playoffs, and made the 1958 NBA Finals against their familiar rivals, the St. Louis Hawks. The teams split the first two games, but then Russell went down with a foot injury in Game 3 and could no longer participate in the playoffs. The Celtics surprisingly won Game 4, but the Hawks prevailed in Games 5 and 6, with Pettit scoring 50 points in the deciding Game 6.

In the following 1958–59 season, Russell continued his strong play, averaging 16.7 points per game and 23.0 rebounds per game in the regular season. The Celtics broke a league record by winning 52 games, and Russell's strong performance once again helped lead the Celtics through the post-season, as they returned to the NBA Finals. In the 1959 NBA Finals, the Celtics recaptured the NBA title, sweeping the Minneapolis Lakers 4–0. Lakers head coach John Kundla praised Russell, stating, "We don't fear the Celtics without Bill Russell. Take him out and we can beat them ... He's the guy who whipped us psychologically."

1959–66
In the 1959–60 season, the NBA witnessed the debut of legendary 7 ft Philadelphia Warriors center Wilt Chamberlain, who averaged an unprecedented 37.6 points per game in his rookie year. On November 7, 1959, Russell's Celtics hosted Chamberlain's Warriors, and pundits called the matchup between the best offensive and best defensive center "The Big Collision" and "Battle of the Titans". Both men awed onlookers with "nakedly awesome athleticism", and while Chamberlain outscored Russell 30 to 22, the Celtics won 115–106, and the match was called a "new beginning of basketball". The matchup between Russell and Chamberlain became one of basketball's greatest rivalries. In that season, Russell's Celtics won a record 59 regular season games (including a then-record tying 17 game win streak) and met Chamberlain's Warriors in the Eastern Division Finals. Chamberlain outscored Russell by 81 points in the series, but the Celtics walked off with a 4–2 series win. In the 1960 Finals, the Celtics outlasted the Hawks 4–3 and won their third championship in four years. Russell grabbed an NBA Finals-record 40 rebounds in Game 2, and added 22 points and 35 rebounds in the deciding Game 7, a 122–103 victory for Boston.

In the 1960–61 season, Russell averaged 16.9 points and 23.9 rebounds per game, leading his team to a regular season mark of 57–22. The Celtics earned another post-season appearance, where they defeated the Syracuse Nationals 4–1 in the Eastern Division Finals. The Celtics made good use of the fact that the Los Angeles Lakers had exhausted St. Louis in a long seven-game Western Conference Finals, and the Celtics convincingly won in five games.

The following season, Russell scored a career-high 18.9 points per game, accompanied by 23.6 rebounds per game. While his rival Chamberlain had a record-breaking season of 50.4 points per game and a 100-point game, the Celtics became the first team to win 60 games in a season, and Russell was voted as the NBA's Most Valuable Player. In the post-season, the Celtics met the Philadelphia Warriors of Chamberlain, and Russell did his best to slow down the 50-points-per-game scoring Warriors center. In the pivotal Game 7, Russell managed to hold Chamberlain to only 22 points (28 below his season average) while scoring 19 himself. The game was tied with two seconds left when Sam Jones sank a clutch shot that won the Celtics the series. In the 1962 NBA Finals, the Celtics met the Los Angeles Lakers of star forward Elgin Baylor and star guard Jerry West. The teams split the first six games, and Game 7 was tied one second before the end of regular time when Lakers guard Rod Hundley faked a shot and instead passed out to Frank Selvy, who missed an open eight-foot last-second shot that would have won L.A. the title. Though the game was tied, Russell had the daunting task of defending against Baylor with little frontline help, as the three best Celtics forwards, Loscutoff, Heinsohn and Tom Sanders, had fouled out. In overtime, Baylor fouled out the fourth forward, Frank Ramsey, so Russell was completely robbed of his usual four-men wing rotation. But Russell and little-used fifth forward Gene Guarilia successfully pressured Baylor into missed shots. Russell finished with a clutch performance, scoring 30 points and tying his own NBA Finals record with 40 rebounds in a 110–107 overtime win.

The Celtics lost playmaker Bob Cousy to retirement after the 1962–63 season, but they drafted John Havlicek. Once again, the Celtics were powered by Russell, who averaged 16.8 points and 23.6 rebounds per game, won his fourth regular-season MVP title, and earned MVP honors at the 1963 NBA All-Star Game following his 19 point, 24 rebound performance for the East. The Celtics reached the 1963 NBA Finals, where they again defeated the Los Angeles Lakers, this time in six games.

In the following 1963–64 season, the Celtics posted a league-best 58–22 record in the regular season. Russell scored 15.0 ppg and grabbed a career-high 24.7 rebounds per game, leading the NBA in rebounds for the first time since Chamberlain entered the league. Boston defeated the Cincinnati Royals 4–1 to earn another NBA Finals appearance, and then won against Chamberlain's newly relocated San Francisco Warriors 4–1. It was their sixth consecutive and seventh title in Russell's eighth year, a streak unreached in any U.S. professional sports league. Russell later called the Celtics' defense the best of all time.

Russell again excelled during the 1964–65 season. The Celtics won a league-record 62 games, and Russell averaged 14.1 points and 24.1 rebounds per game, winning his second consecutive rebounding title and his fifth MVP award. In the 1965 NBA Playoffs, the Celtics played the Eastern Division Finals against the Philadelphia 76ers, who had recently traded for Wilt Chamberlain. Russell held Chamberlain to a pair of field goals in the first three quarters of Game 3. In Game 5, Russell contributed 28 rebounds, 10 blocks, seven assists and six steals. However, that playoff series ended in a dramatic Game 7. Five seconds before the end, the Sixers were trailing 110–109, but Russell turned over the ball. However, when the Sixers' Hall-of-Fame guard Hal Greer inbounded, John Havlicek stole the ball, causing Celtics commentator Johnny Most to scream: "Havlicek stole the ball! It's all over! Johnny Havlicek stole the ball!" After the Division Finals, the Celtics had an easier time in the NBA Finals, winning 4–1 against the Los Angeles Lakers of Jerry West and Elgin Baylor. In the following 1965–66 season, the Celtics won their eighth consecutive title. Russell's team again beat Chamberlain's Philadelphia 76ers 4 games to 1 in the Division Finals, proceeding to win the NBA Finals in a tight seven-game showdown against the Los Angeles Lakers, with Russell scoring 25 points and grabbing 32 rebounds in a 95-93 win in the deciding seventh game. During the season, Russell contributed 12.9 points and 22.8 rebounds per game. This was the first time in seven years that he failed to average at least 23 rebounds a game.

1966–69
Before the 1966–67 season, Celtics coach Red Auerbach retired. Initially, he had wanted his old player Frank Ramsey as coach, but Ramsey was too occupied running his three lucrative nursing homes. His second choice Bob Cousy declined, stating he did not want to coach his former teammates, and the third choice Tom Heinsohn also said no, because he did not think he could handle the often surly Russell. However, Heinsohn proposed Russell himself as a player-coach, and when Auerbach asked his center, he said yes. Russell thus became the first African American head coach in NBA history, and commented to journalists: "I wasn't offered the job because I am a Negro, I was offered it because Red figured I could do it." The Celtics' championship streak ended that season at eight, however, as Wilt Chamberlain's Philadelphia 76ers won a record-breaking 68 regular season games and overcame the Celtics 4–1 in the Eastern Finals. The Sixers simply outpaced the Celtics, shredding the famous Boston defense by scoring 140 points in the clinching Game 5 win. Russell acknowledged his first real loss in his career (he had been injured in 1958 when the Celtics lost the NBA Finals) by visiting Chamberlain in the locker room, shaking his hand and saying, "Great". However, the game still ended on a high note for Russell. After the loss, he led his grandfather through the Celtics locker rooms, and the two saw white Celtics player John Havlicek taking a shower next to his black teammate Sam Jones and discussing the game. Suddenly, Russell Sr. broke down crying. Asked by his grandson what was wrong, his grandfather replied how proud he was of him, being coach of an organization in which blacks and whites coexisted in harmony.

In Russell's penultimate season, the 1967–68 season, his numbers slowly declined, but at age 34, he still tallied 12.5 points per game and 18.6 rebounds per game (the latter good for the third highest average in the league). In the Eastern Division Finals, the 76ers had the better record than the Celtics and were slightly favored. But then, national tragedy struck as Martin Luther King was assassinated on April 4, 1968. With eight of the ten starting players on Sixers and Celtics being African American, both teams were in deep shock, and there were calls to cancel the series. In a game called as "unreal" and "devoid of emotion", the Sixers lost 127–118 on April 5. In Game 2, Philadelphia evened the series with a 115–106 win, and in Games 3 and 4, the Sixers won, with Chamberlain suspiciously often defended by Celtics backup center Wayne Embry, causing the press to speculate Russell was worn down. Prior to Game 5, the Celtics seemed dead: no NBA team had ever come back from a 3–1 deficit. However, the Celtics rallied back, winning Game 5 122–104 and Game 6 114–106, powered by a spirited Havlicek and helped by a terrible Sixers shooting slump. In Game 7, 15,202 stunned Philadelphia fans witnessed a historic 100–96 defeat, making it the first time in NBA history a team lost a series after leading 3–1. Russell limited Chamberlain to only two shot attempts in the second half. Despite this, the Celtics were leading only 97–95 with 34 seconds left when Russell closed out the game with several consecutive clutch plays. He made a free throw, blocked a shot by Sixers player Chet Walker, grabbed a rebound off a miss by Sixers player Hal Greer, and finally passed the ball to teammate Sam Jones, who scored to clinch the win. Boston then beat the Los Angeles Lakers 4–2 in the NBA Finals, giving Russell his tenth title in 12 years. For his efforts Russell was named Sports Illustrated's Sportsman of the Year. After losing for the fifth straight time against Russell and his Celtics, Hall-of-Fame Lakers guard Jerry West stated, "If I had a choice of any basketball player in the league, my No.1 choice has to be Bill Russell. Bill Russell never ceases to amaze me."

However, in the 1968–69 season, Russell seemed to reach a breaking point. Shocked by the murder of Robert F. Kennedy, disillusioned by the Vietnam War, and weary from his increasingly stale (and later divorced) marriage to his wife Rose, he was convinced that the U.S. was a corrupt nation and that he was wasting his time playing something as superficial as basketball. He was 15 pounds overweight, skipped mandatory NBA coach meetings and was generally lacking energy: after a New York Knicks game, he complained of intense pain and was diagnosed with acute exhaustion. Russell pulled himself together and put up 9.9 points and 19.3 rebounds per game, but the aging Celtics stumbled through the regular season. Their 48–34 record was the team's worst since 1955–56, and they entered the playoffs as only the fourth-seeded team in the East. In the playoffs, however, Russell and his Celtics achieved upsets over the Philadelphia 76ers and New York Knicks to earn a meeting with the Los Angeles Lakers in the NBA Finals. L.A. now featured new recruit Wilt Chamberlain next to perennial stars Baylor and West, and were heavily favored. In the first two games, Russell ordered not to double-team West, who used the freedom to score 53 and 41 points in the Game 1 and 2 Laker wins. Russell then ordered to double-team West, and Boston won Game 3. In Game 4, the Celtics were trailing by one point with seven seconds left and the Lakers having the ball, but then Baylor stepped out of bounds, and in the last play, Sam Jones used a triple screen by Bailey Howell, Larry Siegfried and Havlicek and hit a buzzer beater which equalized the series. The teams split the next two games, so it all came down to Game 7 in L.A., where Lakers owner Jack Kent Cooke angered and motivated the Celtics by putting "proceedings of Lakers victory ceremony" on the game leaflets. Russell used a copy as extra motivation and told his team to play a running game, because in that case, not the better, but the more determined team was going to win.

The Celtics were ahead by nine points with five minutes remaining; in addition, West was heavily limping after a Game 5 thigh injury and Chamberlain had left the game with an injured leg. West then hit one basket after the other and cut the lead to one, and Chamberlain asked to return to the game. However, Lakers coach Bill van Breda Kolff kept Chamberlain on the bench until the end of the game, saying later that he wanted to stay with the lineup responsible for the comeback. The Celtics held on for a 108–106 victory, and Russell claimed his eleventh championship in 13 years. At age 35, Russell contributed 21 rebounds in his last NBA game. After the game, Russell went over to the distraught West (who had scored 42 points and was named the only NBA Finals MVP in history from the losing team), clasped his hand and tried to soothe him. Days later, 30,000 enthusiastic Celtics fans cheered their returning heroes, but Russell was not there: the man who said he owed the public nothing ended his career and cut all ties to the Celtics. It came as so surprising that even Red Auerbach was blindsided, and as a consequence, he made the "mistake" of drafting guard Jo Jo White instead of a center. Although White became a standout Celtics player, the Celtics lacked an All-Star center, went just 34–48 in the next season and failed to make the playoffs for the first time since 1950. In Boston, both fans and journalists felt betrayed, because Russell left the Celtics without a coach and a center and sold his retirement story for $10,000 to Sports Illustrated. Russell was accused of selling out the future of the franchise for a month of his salary.