Floyd Mayweather is the best defensive fighter of this era, rarely gets hit flush by using an almost impregnable defence. If he had fought everyone he did in the same manner, but had a glass jaw of Khan's and a dodgy temple of Malik Scott's, who would have knocked him out or beaten him?
his chin is not good his defense is what saves him the rare times he gets hit he wobbles for example the 2 round when a washed up mosley hit him