I think Paul Williams has a chance, but what does Mayweather have to gain? Paul Williams is still ike 25 or 26 or maybe even 27, but still he is so young, and he is only going to get better. Also He is virtually unknown outside boxing circles because nobody will fight him. Williams height, speed, output, and Mayweather's problems with southpaws make this fight relatively close, but I still think Mayweather would block almost every punch and either get on the inside where he would be too quick for Williams or he would counter off the ropes effectively and still beat Williams every round, because until Williams develops a defense Mayweather would virtually hit him at will. Money in this case does make sense, the only reason to fight Paul is if he makes a name for himself, but until then he is just another giant waiting to be toppled by a guy like Cotto who will bust him up to the body. However even Cotto doesn't have that huge a draw in the sport. Sure he is huge in Peurto Rico, and in New York but I think people are overevaluating how popular Cotto is in the popular media simply because Zab Judah and Mosley aren't, suprisingly, household names in America. People might know MOsley because he fought Dela Hoya, but Zab wouldn't be known to almost anyone, and Mayweather still isn't big enough to get the huge numbers he has been getting without huge publicity advertisement, and a popular opponent.