William Stanley Mazeroski (born September 5, 1936), is an American former Major League Baseball (MLB) second baseman. Nicknamed "Maz", he spent his entire 17-year career playing for the Pittsburgh Pirates, from 1956–72. He was elected into the National Baseball Hall of Fame in 2001.
Mazeroski is regarded as one of the greatest defensive second basemen of all time. He was an All-Star for seven seasonsand a Gold Glove Award winner for eight seasons. He was a key member of the Pirates' World Series-winning teams in 1960 and 1971, and is best known for his walk-off home run in the bottom of the ninth inning in game 7 of the 1960 World Series—the only game 7 walk-off homer in World Series history.