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Arthur Mahaffey, Jr. (born June 4, 1938 in Cincinnati, Ohio) is a former starting pitcher in Major League Baseball who played for the Philadelphia Phillies (1960–65) and St. Louis Cardinals (1966). He batted and threw right-handed. In a seven-season career, Mahaffey posted a 59-64 record with 639 strikeouts and a 4.17 ERA in 999.0 innings pitched.