Yes. Had Floyd not hurt his hand that round, he would have finished him. Guerrero had the look of a man who wanted to quit walking back to the corner after that round. Floyd set him up that round with continous body shots which kept Roberts hands low to protect the belly,which led the head open and allowed Floyd to land than the lead right hook almost knocked him out! (which isn't easy because Guerrero is a tough mofo)
He was dazed by that right hook but the 2 straight rights to the body also hurt him and Guerrero was beginning to sag near the end of the round
That round broke his will. You could literally see the fight spirit get sapped out of him as he realized he has no clue how to stop any of the rights (head and body) from Mayweather.
Not very/really hurt obviously, but he clearly didn't like those last few punches at the end of the round.
I guess since Guerrero can only fight one way, he assumes the same of Mayweather. If Guerrero only fights one way, his future opponents should abandon the Berto strategy of allowing Guerrero to bait him into a MMA/WWE wrestling match, and adapt the Mayweather strategy of boxing his face to a bloody pulp from the outside.
https://www.youtube.com/watch?v=b6X1cLtxL8s Definitely hurt. Maybe not to the degree of him being on ***** street, but if Mayweather went for the kill, he would have been out.