Mayweather has Castillo and Corrales in their primes on his resume. De La Hoya is a part-time fighter and at this stage in his career isn't as noteworthy to have on your victory list. Other than those people, I don't really give him much credit for beating anyone else. Gatti, Judah, and Baldomir are names but not good fighters.

Ali has Foreman, Frazier, Shavers, Patterson, Liston, Norton to just name a few.

Sugar Ray Leonard has wins over Hearns, Duran, and Hagler. AND he fought those guys multiple times with the exception of Hagler.

You can even make arguments that people who are currently fighting now like Shane Mosley, Manny Pacquiao, Oscar De La Hoya, Bernard Hopkins, and Winky Wright (the most screwed fighter ever!) have much better resumes than Mayweathers.

If Floyd goes on to beat Hatton and then Cotto and then any of the other elite welterweights (Williams, Cintron, and Margarito), then Floyd will have proper background to those statements he is making.