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Tournaments included international (WBSC), professional (club) and amateur and collegiate levels.

National league seasons
This is the champion from the top domestic league of each respective country.

Other domestic leagues
These are leagues that are either minor leagues, independent leagues or not considered the top tier in a country.

January

 * January 22 – For the second consecutive year, the Baseball Writers' Association of America elects four players into the Hall of Fame, including the first player ever selected unanimously, Mariano Rivera, Major League Baseball's all-time saves leader, who was listed on all 425 ballots cast. Rivera is joined by Roy Halladay and Edgar Martínez, both of whom receive 363 votes (85.4%), and Mike Mussina, who receives 326 votes (76.7%). Rivera and Halladay are both elected in their first year on the ballot, while Mussina is elected in his sixth year and Martínez in his tenth and last. Halladay, who died in a plane crash in November 2017, also becomes the first player to be elected posthumously by the BBWAA since Roberto Clemente in 1973. Also in his final year of eligibility, Fred McGriff was unable to receive enough votes to be elected in to Cooperstown by the BBWAA.

March

 * March 2 – The Philadelphia Phillies reached an agreement to sign free agent outfielder Bryce Harper to a 13-year, $330 million contract. Harper will receive a $10 million salary and a $20 million signing bonus for the upcoming season. He will then be paid $26 million annually from 2020 through 2028 and $22 million annually from 2029 to 2031. In addition, Harper received full no-trade rights and does not possess any opt-out opportunities. It now stands as the largest fully guaranteed contract in the history of North American team sports, surpassing the 10-year, $300 million contract that Manny Machado signed with the San Diego Padres just the previous week, as well as the 13-year, $325 million deal that Giancarlo Stanton signed with the Miami Marlins in 2014. Mexican boxer Canelo Álvarez signed an 11-fight contract worth $365 million in 2018, but the contract is not guaranteed.

April

 * April 2 – Ronald Acuña Jr. and the Atlanta Braves agreed to a $100 million, eight-year contract extension, which is the largest deal for a player under club control with less than one year of service. By way of team options for 2027 and 2028, the deal would max out at $124 million over 10 years. At 21, Acuña became the youngest player to sign a nine-figure contract in major league history, while winning the National League Rookie of the Year in 2018.Through 132 career games, the Venezuelan outfielder posted a .293/.366/.552 slash line, including 32 home runs, 26 doubles, 18 stolen bases, a .934 OPS (144 OPS+) and 5.6 WAR, according to Baseball Reference. Besides, Acuña became the seventh big leaguer to hit 25 home runs in a season before his 21st birthday—and the fastest to reach that mark, in 92 games. The other six on the list are Hall of Famers Mel Ott, Frank Robinson, Al Kaline, Orlando Cepeda and Eddie Mathews, as well as the ill-fated Tony Conigliaro.

May

 * May 15 – Toronto Blue Jays pitcher Edwin Jackson made history when he set a Major League Baseball record by playing for the 14th different club during his 17-year career. Jackson made his debut with the Los Angeles Dodgers in his 20th birthday. Afterward, the now 35-year-old has played for the Tampa Bay Rays, Detroit Tigers, Arizona Diamondbacks, Chicago White Sox, St. Louis Cardinals, Washington Nationals, Chicago Cubs, Atlanta Braves, Miami Marlins, San Diego Padres, Baltimore Orioles and Oakland Athletics before joining the Blue Jays. In his debut for them, Jackson pitched five innings without a decision in a 4–3 loss to the San Francisco Giants at Oracle Park. He allowed three runs — two earned — on six hits and one walk while striking out two batters and hitting one, leaving after 77 pitches with the score tied at 3–3.

June

 * June 3 – Adley Rutschman became the first overall selection in the 2019 MLB Draft after being selected by the Baltimore Orioles.

August

 * August 13 – Chris Sale of the Boston Red Sox became the fastest pitcher in Major League Baseball history to record 2,000 strikeouts in the 7–6 victory over the host Cleveland Indians that lasted ten innings, while Jackie Bradley Jr. made the difference with a solo home run in the top of the 10th. Sale entered the game with 1,995 strikeouts and struck out Oscar Mercado in the third inning to reach the milestone in 1,626 innings, breaking the mark set by Hall of Famer Pedro Martínez, who reached it in 1,711⅓ innings. Career strikeout leader Nolan Ryan (5,714) needed 1,865⅔ innings. Sale finished with 12 strikeouts in 6⅔ innings of work and did not factor in the decision. Besides, Red Sox third baseman Rafael Devers went 6-for-6 with four doubles, becoming the first player in Major League history to record six or more hits and four or more doubles in one game.
 * August 14 – Los Angeles Angels slugger Albert Pujols collected two hits and drove in three runs, leading the Angels to a 7–4 victory over the visiting Pittsburgh Pirates, while setting the Major League record for hits by a foreign-born player. With 3,167 hits, Pujols surpassed fellow Dominican Republic native Adrián Beltré (3,166) and took sole possession of 15th place for career hits in MLB history. Besides, Pujols is already the all-time leader among foreign-born players in home runs (651), doubles (653), runs scored (1,815) and RBI (2,052).

September

 * September 5 – Class A Lowell Spinners pitcher Yusniel Padrón-Artiles struck out 12 consecutive Batavia Muckdogs, which set both an MLB and Minor League record for the most strikeouts in a row. Lowell prevailed, 2–1, when Joe Davis hit a walk-off homer in the bottom of the ninth. Padrón-Artiles, a 21-year-old Cuban prospect of the Boston Red Sox, relieved Jay Groome in the fourth, went six extremely strong innings, allowing just one hit while striking out a career-high 14 batters overall.
 * September 28 – New York Mets first baseman Pete Alonso slugged his 53rd home run in the Mets 3–0 win over the Atlanta Braves at Citi Field, to break the MLB rookie record set by New York Yankees outfielder Aaron Judge in the 2017 season.

October

 * October 30 – The Washington Nationals win their first World Series in franchise history by defeating the Houston Astros 6–2 in game 7 of the World Series. Washington Nationals pitcher Stephen Strasburg was named 2019 World Series MVP.

January

 * January 1 – Walt McKeel, 46, reserve catcher who played for the Boston Red Sox and Colorado Rockies in a three-season span from 1996–2002.