Come on guys, let's be realistics:

1. Castillo fought Mayweather at 140 and is smaller than Margarito and not stronger. THus, Margarito's body punches would be more effective (and Castillo really won the first fight, by the way).

2. Margarito is more of a body attacker than Castillo, simply because he is (and he's stronger).

3. Hatton was a blown up junior welter. Slower and less powerful. In those clinches (there were so many), Hatton was able to land many body shots. Do you really think Mayweather will be able to clinch effectively with a stronger guy like Margarito? For 12 rounds?

4. Did you see de la Hoya's body attack (something he is not known for)? He went to Floyd's body like a little bitch. Rat-a-tat-tat.

5. Baldomir is a light hitter. Any body attack he makes tickles more than hurts and he is also slower than mollasses. Of course Floyd is not going to let Baldomir near him.

6. Simply put, Margarito is a stronger and better fighter than Hatton and Baldomir. I would never use them to judge how Margarito would do against Mayweather. He has the best chance of landing one rib breaking body shot that can end the fight.