You know, I recently ranted on a different board about this exact same subject. I have NEVER seen a real-life sports supplement for ANY role-playing system (leaving aside for the moment pro wrestling). I can't imagine why no one has ever written a thing.
Think about it. Sports Hero could be a really crunchy big book detailing a few dozen common sports:
* Template characters for each position
* Equipment, built in HERO
* Rules for playing out each sport in HERO terms
I mean, that would be a HUGE seller, wouldn't it? I'd buy a copy in a second. You'd probably sell a good number to non-HERO fans, simply because it's a popular topic never touched on by other systems. Heck, you could even spin off aSports Hero: X-treme Edition, for extreme sports fans!
Jon