The Collaborative International Dictionary of English v.0.48:

Wrestler \Wres"tler\, n. [AS. wr[=ae]stlere.]
   One who wrestles; one who is skillful in wrestling.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wrestler
    n 1: combatant who tries to throw opponent to the ground [syn:
         wrestler, grappler, matman]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "wrestler":
   amateur athlete, archer, athlete, ballplayer, baseballer, baseman,
   batter, battery, blocking back, bowman, catcher, center, coach,
   competitor, cricketer, defensive lineman, end, footballer,
   games-player, gamester, grappler, guard, infielder, jock, jumper,
   lineman, matman, offensive lineman, outfield, outfielder, player,
   poloist, professional athlete, pugilist, quarterback, racer,
   scuffler, skater, sport, sportsman, tackle, tailback, toxophilite,
   wingback