Greg Allen Harris (born November 2, 1955) is an American former professional baseball pitcher, who played in Major League Baseball (MLB) for 15 years (1981 to 1995), Harris pitched in 703 career games, starting 98.
He pitched for the San Diego Padres in the 1984 World Series, which they lost to the Detroit Tigers in five games.
Though he spent his career as a right-handed pitcher, Harris threw left-handed to two batters in a 1995 game (the penultimate game of his career), becoming the first switch pitcher to pitch in a Major League game in the modern era.
Harris also was unusual in that, for periods in 1991–93 pitching for the Boston Red Sox, he achieved success while throwing curve balls almost exclusively.