Keidel: Was Muhammad Ali Boxing's Greatest?Muhammad Ali, an unparalleled sports icon and hero to many, was not the greatest boxer ever.
Silverman: The Best Ever? Floyd Mayweather Jr. Needs To Calm Down Just A BitAll of the greats knew that you had to open your soul and leave a piece of it in the ring. Mayweather has never done that.
Mayweather Says He Will Retire After Sept. 12 Fight Against Andre BertoBerto, a 2004 Olympian, was once thought of as a rising star but has lost three of his last six fights. Two of those losses were to Robert Guerrero and Victor Ortiz, fighters that Mayweather beat easily.
Keidel: The Immortal Mariano Rivera -- The Final Number 42Mariano Rivera, the Final 42, sui generis of any generation, the man whose mythology isn't hyperbole. To list his bona fides is to not only insult him and you, but also his peers, since he has none.
Robert Guerrero Believes He Will Be 1st Fighter To Take Down Floyd Mayweather Jr. Guerrero believes he is the fighter who will be the first to beat Mayweather, and he's eager to earn both the recognition and the money that would come with such a win.

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