By this I mean players that had several standout years or seemingly endless potential but injuries derailed their careers not drugs/alcohol, etc
NFL-Gale Sayers, Terrell Davis
NHL-Mario Lemieux(the worst of all), Mike Bossy, Eric Lindros
MLB-Ken Griifey, Jr., but nothing else comes to mind...
NBA-Jayson Williams, Jason Williams(Duke standout), Bobby Hurley
The saddest story is without a doubt Mario Lemieux;the guy was BETTER than Gretzky, but between cancer,back problems,etc he just didnt have thesame impact as 99







