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Sandy Koufax is an American left-handed former pitcher in Major League Baseball who played his entire career for the Brooklyn/Los Angeles Dodgers, from 1955 to 1966.

Koufax's career peaked with a run of six outstanding seasons, before arthritis ended his career at age 30. He was named the National League's MVP in 1963, and won the 1963, 1965, and 1966 Cy Young Awards by unanimous votes. He was the first major leaguer to pitch more than three no-hitters (including a perfect game).

Among NL pitchers with at least 2,000 innings pitched who have debuted since 1913, he has the highest career winning percentage (.655) and had the lowest career ERA (2.76) until surpassed by Tom Seaver. His 2,396 career strikeouts ranked 7th in major league history upon his retirement. Retiring at the peak of his career, he became the youngest player ever elected to the Baseball Hall of Fame.

Koufax is also known as one of the outstanding Jewish athletes of his era in American professional sports. His decision not to pitch Game 1 of the 1965 World Series because game day fell on Yom Kippur, the Jewish Day of Atonement, garnered national attention as an example of conflict between social pressures and personal beliefs.