Who is a tougher fight for Mayweather, Marquez or Bradley?

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I say JMM is a tougher fight because he is a proven world class fighter. Bradley, I am just not sold on at this point, I mean he may in fact have a glass jaw, and he doesn't see to have much power. His speed is good not great but good, he has shown he has a ton of heart and the determination to win though....