Manny will start quick and throw a lot of punches , missing a lot and Floyd taking a lot on the arms, but the crowd will make it feel like he's having more success than he is. Now and again, as Manny's coming in , Floyd will nail him on the counter. Manny will be surprised by Floyd's power and it will start to make Manny think twice as the fight goes on.
In the middle rounds, Manny won't be able to find a way in without getting punished and will start to get frustrated. Floyd will start to gradually ease away.
In the later rounds , Floyd will start to dominate more and more, and although Manny will show a lot of heart so as not to get stopped, Floyd will win comfortably enough on points.
I'm not saying it will be a UD , because if a judge can give Canelo a draw after the way that fight went, anything can happen. Manny may get a draw on one card or even get the nod on one card (incorrectly) , but all in all a pretty standard Floyd win.