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Description: Mark David McGwire (born October 1, 1963), nicknamed Big Mac, is an American former professional baseball first baseman and currently the bench coach for the San Diego Padres. His MLB playing career spanned from 1986 to 2001 while playing for the Oakland Athletics and the St. Louis Cardinals, winning one World Series championship each with Oakland as a player in 1989 and with St. Louis as a coach in 2011. One of the most prolific home run hitters in baseball history, McGwire holds the major league career record for at bats per home run ratio (10.6), and is the former record holder for both home runs in a single season (70 in 1998) and home runs hit by rookie (49 in 1987). He ranks 11th all time in home runs with 583, and led the major leagues in home runs in five different seasons, while establishing the major league record for home runs hit in a four-season period from 1996-1999 with 245. Further, he demonstrated exemplary patience as a batter, producing a career .394 on-base percentage (OBP) and twice leading the major leagues in bases on balls. Injuries cut short the manifestation of even greater potential as he reached 140 games played in just eight of 16 total seasons. A right-handed batter and thrower, McGwire stood 6 feet 5 inches (1.96 m) tall and weighed 215 pounds (98 kg) during his playing career.