Oh yeah. Very easy. What f*ckin dumb*ss question If he was easy to beat he would've been beaten already wouldn't he?!
A fighter such as Floyd Mayweather is so difficult to beat that he has to disregard proper training for some reason like mentioned above by the thread starter or moving up to a division where his physical and technical attributes won't be enough to overcome natural adversity such as above 154 pounds and in my opinion. Mike McCallum was simply unbeatable at light middleweight and he had to meet one Sumbu Kalambay from Italy to find that loss. Marlon Starling also lost just in a majority decision to Michael Nunn. And even Roberto Duran, exception made to his rematch with Sugar Ray at welterweight, had to be KFO by Tommy Hearns at above 154 pounds...