Here's two real life matches..

Chuck Zito (Pancamo in tv show OZ) v Jean Claude Van Damme

(Zito beat him up badly & threw him down some stairs in a bar in NY)

Elvis Stoiko v Eric Lindros

This one is likely more than a Canadian Urban legend. It apparently happened in a bar when Elvis didn't appreciate some comments made about figure skaters by Lindros. Stoiko does have a black belt in martial arts and Lindros is a big mouthed idiot.