Sturm would knock him into the 3rd row. Manny said himself he had a hard time taking Margarito's punches at 150 because of the weight. A skilled MW like Sturm would kill him.
Likely true, although it should be noted that Sturm isn't a big punching MW, he has a 40% KO record. He tends to cover up Clottey-style when getting hit too.
An equally interesting question is whether Mayweather could beat Sturm today.
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