Martinez fights at 160 anyways, right now the only one with a chance is Mosley, because he's the one fighting him.
i think Mayweather has the great chance to beat Pacquiao at anyweight but Marquez, I dont think he could handle Pacquiao right now at this point even @135
Mosley can beat him if he can get a right cross in there. That's why Pacquiao might try to take him out early. Mayweather doesn't want to fight Pacquiao. Pacquiao's quick feet and right hook are all wrong for Mayweather. Ortiz or Berto both have good offense, zero defense.
Cotto, Margarito and Clottey are too big and strong for Pac. They would destroy him. If Floyd fought those 3 he would just outbox them without any of them landing a power shot