Khan and Golovkin are obviously threats to him. They mightn't beat him but they would certainly stand a good chance. Garcia, Canelo and Cotto I don't think stand much chance, unless Mayweather becomes shot in the next few months
Gennady golovkin would ko him, Khan would have a chance of beating him in Britain although I think mayweather wins in America and cotto could beat him at 160. Also I think brook would give mayweather a decent fight but I'd quite like to see mayweather vs mattysse even though mayweather would probably win.
LOL at people even voting for GGG. May will duck that monster like the plague. Canelo brings nothing to the table. Garcia is also not possible. Showtime losses way too much money paying 32m for this fight. Cotto is not possible either - Haymon will die before he allows a Roc Nation fighter to share the spotlight of a huge big ppv event. Khan will sell enough in the US and England that Showtime won't lose money, he's a haymon/sho fighter, and actually....he's the best style matchup to make a fun fight.