Mayweather recently took a diss at McGregor and the sport of mixed martial arts by claiming that real men do n't wrestle on the ground .
Mayweather is a boxing phenom with an unblemished record of 49 - 0 .
Mayweather , a boxing phenom with an unblemished record of 49 - 0 , recently took a diss at McGregor and the sport of mixed martial arts by claiming that real men do n't wrestle on the ground .