5'6 MMA fighter or boxer vs 6'3 street fighter in a fist fight, who'd win?
the mma fighter will absolutely destroy the street fighter. but you have to take into account that there are people on the street who are trained in mma. so when you say street fighter im assuming you mean someone without training.
IF YOU WOULD QUIT ASKING, I WOULD WIN!!!
If the 6'3" guy is proportioned to his height, then i'm going to bet on the him.