The two were supposed to fight their third fight but Razor retired the night before the match, thus ending both of their careers. The third fight takes place after what was a joking conversation that turned into something more serious.
I went into this film with little expectation. The supporting actors are what really pulled the movie together, with great performances from Kevin Hart, Kim Basinger and Jon Bernthal. If you don't mind Sylvester Stallone's awkward attempts at facial expressions, then you might enjoy this popcorn flick.