By Miguel Rivera

Cuban coach Pedro Diaz, who previously trained WBC middleweight champion Miguel Cotto, says his former fighter - now with Hall of Fame trainer Freddie Roach in his corner - could pull off a big upset of Floyd Mayweather Jr. in a rematch.

Diaz looks up to Roach and says Cotto is now a better overall fighter with Freddie in his corner. Cotto is being mentioned in boxing circles as a backup opponent if discussions for a fight between Mayweather and Manny Pacquiao falls apart for May 2nd.

"I think Miguel is an extraordinary fighter. He's very talented. And now I think he has the best corner of the world. Freddie Roach is doing a great job. But Miguel is an extraordinary fighter. The first fight with Mayweather was a very exciting fight. And if he fights him now with Freddie in his corner - who also has a strong team - I think [Miguel] can achieve a superior performance he might even change the outcome [of the first fight]," Diaz told El Vocero.