It's a toss up in my mind. For Cotto to win he has to hurt Williams and take away his punch output. If Williams isn't hurt by Cotto he wins a decision, if Cotto can hurt him he either stops him late or does enough in the latter rounds to win the fight.

It's a real tough fight for both fighters though.

Personally I think the next 3-5 years are going to see some fantastic rivalries developing and maybe finally some great trilogies for the modern era.