4. Miguel Cotto
They only just fought at the end of last year, but it was a quality contest. While Cotto of course was competitive, Alvarez won it on points.
The Puerto Rican will have a better understanding of Canelo now and another 12 rounds with this veteran would again help Alvarez develop further.
Both have explosive power to go with their ring smarts, so a rematch will always hold some appeal.