It's a pick em fight. Mayweather has timing and quickness and is able to make some amazing athletic moves where otherwise he collects more damage during a fight with faster fighters. That athleticism and his reflexes has slowed some, so I would expect even with the slower Pacquaio he will absorb more blows than in his previous fights. Obviously he will look to tie Pacquiao up so he can't through so many punches to keep the fight close. I don't expect a KO. If Mayweather can't tie Pacquiao up, I think he's slowed down too much and Pacquiao wins a close Decision. If Mayweather has sandbagged us with his last 3 fights, then he should be able to take 6 or 7 clear rounds. They have both been through tons of media exposure and both are confident so there won't be any head game advantage. Any mental advantage will have to happen in the ring. I really think this fight comes down to who wants it more.