The title holders who Floyd Mayweather Jr. DID NOT fight:

Welterweight: Miguel Cotto, Paul Williams, Antonio Margarito, Shane Mosley, Luis Collazo, Carlos Quintana

Light Welterweight: Miguel Cotto, Vivian Harris, Kostya Tszyu

Lightweight: Paul Spadafora, Leonard Dorin, Artur Grigorian

SuperFeather: Joel Casamayor, Acelino Freitas

...I think a couple of those guys would have done OK with Floyd, guess we'll never know, infact I KNOW I will catch hell for even posting such a blasphem against the All Great Floyd Mayweather Jr. the fighter who is great not because of WHO he fights but only because of the skill he has