BULK ORDER DISCOUNTS AVAILABLE: inquire at support@playervault.io.: Mark McGwire is one of the most feared power hitters in baseball history. The 1987 AL Rookie of the Year launched a then-rookie-record 49 home runs, formed the Bash Brothers with Jose Canseco, and won the 1989 World Series with Oakland. In 1998, he hit 70 home runs for the St. Louis Cardinals to break Roger Maris's single-season record. A 12-time All-Star, McGwire finished with 583 career homers.