Mark David McGwire , nicknamed "Big Mac", is an American former professional baseball player who played his major league career with the Oakland Athletics and the St. Louis Cardinals. He is currently the hitting coach for the St. Louis Cardinals. For his career, McGwire averaged a home run once every 10.61 at bats, the lowest at bats per home run ratio in baseball history . In 1987, he broke the single-season home run record for rookies, with 49. In 1998, McGwire and Sammy Sosa achieved national fame for their home run-hitting prowess in pursuit of Roger Maris' single season home run record;... McGwire broke the record and hit 70 home runs that year. Barry Bonds now holds the record, after hitting 73 home runs during the 2001 season. After three years at Southern California and a stint on the 1984 U.S. Olympic team, McGwire was drafted 10th overall by the Oakland Athletics in the 1984 Major League Baseball Draft. McGwire made the major leagues in August. As a rookie in 1987 he hit 33 homers before the All-Star break and was a unanimous choice for AL Rookie of the Year after finishing with 49 homers, 118 RBIs and a .289 average.
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