In the first minute of the second round Castillo went down on a shot by Mayweather, which was ruled a slip by the referee. Later in the fight Harold Lederman alluded to it, saying "By the way, that knockdown in the second round [is] extremely questionable, I thought Floyd did throw a left hook and this guy [Castillo] went down at the end of the hook but what you going to do, it's a judgement call by the referee, so it doesn't go as a 10–8 round. . . " Drakulich took a point from Castillo for hitting on the break in the eighth round after several warnings throughout the fight. With Castillo repeatedly hitting on the break, this led to a large number of his punches landing. George Foreman agreed with the decision ("That's what you want a referee to do"), although his counterpart Larry Merchant had an alternative view: "I think this referee has been altogether too involved in the fight. Too officious".  Drakulich struck again in the ninth round, this time taking a point away from Mayweather for using his elbows. Mayweather won the fight by using his jab effectively and staying away from Castillo for much of the fight.  Having injured his left shoulder on the last day of training, he changed to a southpaw stance on several occasions to throw more right-handed punches.