chrisd said:
Hmm, I've never seen Mass Oyama fight but from reading about his exploits he was pretty effective. If memory serves he used to tour America offering to beat anyone within 2 minutes or he would give them $100(maybe the figure is wrong but it was a lot of money for the time) and retired undefeated including against boxers and pro-wrestlers. There is also a story of how he killed a bull with his bare hands and after the 'fight' the butcher proclaimed the meat unfit for human consumption, matadors be damned
For whatever it is worth I think that Bruce Lee would have stood a very good chance in his own weight class at MMA and with some of the more modern training methods and maybe more mixing of disciplines could potentially have been even more effective.
Mass Oyama also would have been a very good competitor if even half the tales about him are true but from what I understand he and Bruce Lee would have been in quite different due to size differences so not exactly a fair fight and to proclaim one better than the other misses that both were great fighters in their own chosen disciplines.