Cotto chances are slim. I don't think he has the tools for the job. Maybe his best chance is to try and get all over mayweather, but still, thats the flawed strategy that most of mayweathers previous opponents tried.
The best tool he's got is is jab, which is ramrod and well timed. His left hook is good but mayweather's philly shell puts a dampener these punches. in fact left hooks are liability against mayweather as he counters so well off of them.
So how does cotto have a good chance, other than a punchers chance?