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.
We should not forget that Floyd is older than Manny 
. "Battle of the Oldies" but i think Mayweather has the advantage even if he is older maybe because of the breed lol.Their last bout says not that better because Manny is suffering from arm injury (in which if true the fight must not be set right?)and now if they will be on the ring together if given a chance I think the fight will be more exciting and worth to watch
Excitement only felt by the fans when Manny hits Mayweather but it did not happen most of the time in the game, it was Mayweather who dominated the fight and because of that, it results to a boring fight since that's how he fights.
Manny vs Mayweather is bound to happen next year as Manny has said hell only think of wrestling next year and what better way to finally end his carrier by taking on and defeating Mayweather. The last time these two met Manny was injured and Mayweather just decided to sit back and defend hence it was dull, but this time itll be different as Manny will definitely try to knockout Mayweather. Do you think Mayweather presence during Mannys match is another indication that a rematch in on the cards?.
News Source: https://www.firstpost.com/sports/manny-pacquiao-beats-keith-thurman-by-split-decision-to-become-oldest-welterweight-champion-in-boxing-history-7028871.html
https://www.foxsports.com/boxing/story/manny-pacquiao-floyd-mayweather-keith-thurman-rematch-072219