As a first baseman , McGwire played in Major League Baseball for the Oakland Athletics and the St. Louis Cardinals between 1986 and 2001 .
Mark David McGwire ( born October 1 , 1963 in Pomona , California ) is a former right-handed First baseman in Major League Baseball who played for the Oakland Athletics ( 1986-1997 ) and the St. Louis Cardinals ( 1997-2001 ) .