gamer
 n.— «Ken Caminiti’s fellow players called him a gamer. In professional baseball parlance, that is someone who plays through pain when injured, someone who is willing to do whatever it takes to win.» —“Caminiti Was a Gamer Who Played Hard Even When Hurt” by Kelly Candaele New York Times Oct. 17, 2004. (source: Double-Tongued Dictionary)