Who Has the Better Chance of Pulling Off the Upset?

JMM or Ortiz? Personally I think they both have about equal chance. JMM will always have the style to make Pac work, he's given him a tougher fight and is a better all around boxer then any of Pac's opponents at ww and beyond, but if he's slowed down even a little bit it's going to be tough. Ortiz is probably the most live opponent Mayweather has faced in some time. He's fast, a souhpaw, and has power(something haters always say is Mayweather's weakness, except of course when they talk about Ortiz). His boxing ability is lacking but he will come to fight and if nothing else will test both Mayweather's chin and legs after such a long layoff. Discuss, poll coming. Edit: If you feel neither or both have equal chance just post and explain why.