Who give's Mayweather the best run for his money?

[BoxingGorilla]

I think Mayweather should fight Tim Bradley and do it before Pacquiao can. Bradley can sure as shit do a better job than Mosley did.

Fight Berto.

Those are my top two for Mayweather. Tim Bradley or Andre Berto. Besides Manny, of course.

Also, Mayweather would be taking out a fighter with a "0" on his record.