Guerrero is a very good fighter without any glaring deficiencies, but he doesn't have anything that makes me think he poses a serious risk to Mayweather, barring Mayweather finally starting to slide. He's above average in most areas, but exceptional in none and I don't think he brings anything to the table that we haven't already seem Mayweather deal with.

While I do not think Berto would beat Mayweather either, I really believe that Berto's handspeed, determination, and power would make for a much more intriguing match.