The crossword solution for the term 'McGwire Competitor' is SOSA, which is a four letter word. Sammy Sosa was a Major League Baseball right fielder who played for four teams from 1989 to 2007. He is best known for his time with the Chicago Cubs and his race with Mark McGwire to break Roger Maris' single-season home run record in 1998. Sosa finished with 66 home runs that season, while McGwire hit 70.