I actually think Marquez did better.

Alright Mosley had one good round but then was dominated the rest of the fight and pretty much settled into his beating getting busted up.

Marquez though never stopped attacking, and went through every single plan A-Z against Floyd, and kept trying to bring it to him. I think Marquez did better because he never stopped trying and kept wanting to bring it, and even at the times Mayweather looked on the verge of completely dominating him Marquez would always try to come back and respond with something.

Compare that to Mosley who got beat so badly he just settled into it like a child who doesn't see the point in grabbing the belt anymore and decided to spend his time smack talking and loading up for one right hand, and i'll take Marquez's performance any day of the week.