Raging Bull - Martin Scorsese directed Robert De Niro (in his Oscar-winning role) who played Jake La Motta who fought Sugar Ray Robinson and all his (La Motta's) demons.
The Color of Money - Wouldn't have called this a sports-themed film two years ago, but with pool in the sports limelight I suppose that's what it can also be called now. I consider this bare-bones DVD a real gem. No one ever talks about it, but it satisfies the movie lover in me more than several special editions. Features Paul Newman at the absolute peak of his powers. Well, what do you know, I just looked at it and it's also from Scorsese.
I have a stack of NBA DVDs, and the best one is NBA's 100 Greatest Plays. If you like the weekly top 10 plays, well, here's more than a hundred of them. Havlicek stole the ball, Bird stole the ball, Dr. J does the impossible, etc. They still missed a number of my favorite plays, but it's a good disc.