I mean if you look at Castillo fighting without hindsight of the Mayweather fights, you wouldn't even think he would win 4 rounds against Mayweather. But there was something with the way he ducked and come up with his punches that was giving Mayweather so much trouble. Even in the rematch he was still giving Mayweather a lot of problems by ducking and coming up with his shots. im not saying Castillo isn't a good fighter but with his come forward style you would think this would be a perfect stylistic match up for Mayweather like it had been with all the other pressure fighters Mayweather fought, but yet he gave him so much trouble. Even if you look back there is nothing to suggest that Castillo would give Mayweather two tough fights. I know its just one of those things where a boxer has your number, but you would think this would be perfect match up for Mayweather because he fights best when his opponent is constantly pressuring him.