In terms of the toughest night: Castillo I Castillo II Cotto C. Hernandez J. Chavez Judah Augustus --- I also agree with the guy above about Castillo I. I thought Mayweather clearly took the first 5 rounds.
This is a lie. He fought lighter weight boxers such as Hatton, Marquez and Guerrero. He fought old DLH and old Mosley. Pac was on top, in his prime and Floyd avoided him.
Gotta go with Castillo . Delahoya comes second , Miguel follows up right behind him in 3rd . The Judah fight gets underrated and forgotten , Judah gave Floyd a hard fight and manage to drop him .
I had Castillo winning a close fight, but i voted Cotto based on May not being at his best that night (broken hand), and winning clearly in the second fight.