Info: http://www.imdb.com/title/tt0320512/

The Smashing Machine", which follows mixed martial arts competitor Mark Kerr's career from late '99 until the Pride Grand Prix 2000 tournament in Japan, is a stunning and provocative look at a man whose fights with his own personal demons rival those he encounters in the ring (or in the octagon). Also featured in the documentary is Mark Coleman, who at the time was coming off a two-year slump in the sport.

Links:
Part 1
Part 2