Williams gives Floyd more trouble than Cotto would with his height, reach, good jab, very good chin, and great workrate. Williams is very good fighter. I give Floyd the edge cause he is so great but Williams is taking at least 4 rounds and it is going the distance if they fight.
i haven't seen much of williams. but if i will base it from his last fight, imo, he will give floyd some trouble because of his height and reach advantage plus his workrate. but because of mayweather's skills, he would still be a slight favorite.
I'd say this is a toss it up. Floyd has handled boxers who were very tall for their size such as Tony Pep, (who was 6'1) Genaro Hernandez, Oscar Delahoya, Diego Coralles. He's done it before but Williams is different from those guys because he's young and naturally bigger then Coralles, Pep, Hernandez and Delahoya. In the fight against Pep (who was a good technically schooled fighter) he bascially made Pep miss on every punch he threw. Can he do that to Williams? I don't think so.
Someone argue with MacManJr. or Fab2333, I am seeing way too many of other peoples' avatars in this thread. I miss theirs. Floyd is too fast for the tall, light hitting Williams.
Williams, I think his style is all wrong for Floyd. I don't see Floyd figuring out a way to beat Williams, and I think he would give away a lot of the early rounds hoping to be able to slow him down and counter him. Williams will walk through Floyd and never stop throwing. I see him winning a UD 9-3. Williams isn't Hatton, he is way bigger, has 16' more reach, a good jab (which you need to beat Mayweather), and a good chin.