Twin Fist
Grandmaster
Rollerball
Rollerball
"A better pick might be "Chariots of Fire" - a very good film indeed. I suppose it might not be considered a 'sports flick' in the strict sense of the word tho' as it's nominally about athletics.
"P.S. As an aside, those that haven't seen "Occurrence at Owl Creek Bridge" can find it here (it's pretty short and made in the early 60's but it will not be a waste of your time) : http://www.liketelevision.com/liketelevision/tuner.php?channel=139&format=movie&theme=guide
I'm surprised that no one so far has mentioned the original Rocky movie, that was always a classic. The first Best of the Best was good as well as Warrior.