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In MLB, Warren Spahn of the 1963 Milwaukee Braves with 23 wins at the age of 42.
== == Ed Morris had 12 in 1886, which is the AA record for Lefthanders Sandy Koufax had 11 in 1963, which is the NL record for Lefthanders The American League record for shutouts in a season by a southpaw is 9 and held by Ron Guidry of the Yankees (1978) and Babe Ruth of the Red Sox (1916).
Randy Johnson ended his career with 303 wins and 166 losses.
Tim Wakefield had 200 wins during his career. He won 186 with the Boston Red Sox and 14 with the Pittsburgh Pirates.