http://en.wikipedia.org/wiki/Sam_Langford

Fought from lightweight up to heavyweight, he was 5'7". Heavyweights didnt want to fight him.This guy fought about once a week, maybe two weeks after a tough fight.Joe Walcott got a decision draw, the weight wasnt disclosed so he has never gotten a shot at a non-negro title in the US, he did get shots at foreign titles.Jack Johnson ducked him like crazy then finally fought him to win a decision, he outweighed Langford 185 to 156 He didnt want to rematch later on. Boxrec has him at 200-47-46 but who knows really.The guys he fought in heavyweight were good fighters too, he was usually the smaller guy.