Christy Mathewson wins his 300th game On June 13, 1912, Christy Mathewson wins his 300th major league game. In the top of the ninth inning with no outs at New York’s Polo Grounds, Christy Mathewson strands a runner on third base to record his 300th victory when the New York Giants edge the Cubs, 3-2
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Source: Historical record