...because he believes he would get the same results.
As much as I want Manny to win if ever they will meet again inside the ring, I think I agree with Mayweather here. The performance that Manny has shown in his bout with Thurman may be amazing, with a knockdown even, but I can see an old Manny in there. I didn't see the hunger for a knockout after he saw Thurman standing back after the knockdown. With that performance, I am afraid he won't be able to equal Mayweather's athleticism, especially agility.
Manny is fast but Mayweather is faster he can't beat a man who keeps running in the entire game, in addition, that would result to disappointment of the fans as the hype of the possible rematch could be bigger than why Thurman vs Manny fight created.