Warren Edward Spahn (April 23, 1921 – November 24, 2003) was a Major League Baseball left-handed pitcher who played his entire 21-year baseball career in the National League. He won 20 games or more in 13 seasons, including a 23–7 record when he was age 42. Spahn was the 1957 Cy Young Award winner, and was the runner-up three times, all during the period when one award was given, covering both leagues. He was elected to the Baseball Hall of Fame in 1973, with 83% of the total vote.(His eligibility was delayed, under the rules of the time, by two years of token minor league play.)

Spahn won 363 games, more than any other left-handed pitcher in history, and more than any other pitcher who played his entire career in the post-1920 live-ball era. He is acknowledged as one of the best pitchers in Major League Baseball history. The Warren Spahn Award, given to the major leagues' best left-handed pitcher, is named after him.

Regarded as a "thinking man's" pitcher who liked to outwit batters, Spahn once described his approach on the mound: "Hitting is timing. Pitching is upsetting timing."

His major league career began in 1942 with the Braves and he spent all but one year with that franchise, first in Boston and then in Milwaukee. He finished his career in 1965 with the New York Mets and the San Francisco Giants. With 363 wins, Spahn is the 6th most winning pitcher in history, trailing only Cy Young (511), Walter Johnson (417), Grover Cleveland Alexander (373), Christy Mathewson (373), and Pud Galvin (364) on MLB's all-time list. He led the league in wins eight times (1949–50, 1953, 1957–61, each season with 20+ wins) and won at least 20 games an additional five times (1947, 1951, 1954, 1956, 1963).

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