mrom wrote:
Here's maybe an equivalent question: who would win in a pickup basketball game: a young Muggsy Bogues at 5'3", 135 lbs or a 6'2", 220 lb NFL player? I think the answer is clear that the NFL player would have no chance. (And same answer for the fighting question. )
But there are plenty of plausible sounding but ultimately empty arguments in favor of the NFL player - - "with all that extra size and strength the NFL player can just back Muggsy down until he can shoot a layup", or "with the height advantage the NFL player will get every rebound and there's no way Muggsy can block him"
I don't think this is really an equivalent question. The OP's premise involves any random 5'4"/125lb professional boxer. Yours specifically involves the best basketball player ever of his size.
If the OP's question had been "could the best flyweight boxer ever beat up a 6-2 200 pound athletic guy," your question would be analogous, but I don't think it's as clear cut since we're discussing any random small boxer.