TweetI dont see why Mayweather would say anything about an MMA fighters stamina. He never rolled with Chad Mendez. Went 5 rounds with Diaz. Not only do you have to punch but kick, grapple, defend take downs and the whole fence thing. Way different animal in MMA. Not saying boxing is easy by any means but there is a reason they only go three rounds and 5 for championships. It sucks.