Don't know if this fight will ever take place but it should have in 99. Mosley had not moved up yet and he was dominating at 135, Mayweather just won fighter of the year in 98 and was flying high. It would have been an epic battle. Mosley I believe packed more power, speed was very close because both fighters where blazers but Mosley should have a tiny advantage, Mayweather had better defense. Mosley I believe in a UD. If they fought at 147 currently Mayweather in a route.