Floyd Mayweather didn't earn the nickname "Money" by playing it safe—he built a spotless 50-0 record with brains, bravado, and brutal precision. His fights helped shape the legend.

By Mark Vester WBA welterweight champion Shane Mosley would like nothing more than to knock Floyd Mayweather Jr. out on May 1 at the MGM Grand in Las Vegas. Mosley will switch-hit that night.

The Floyd Mayweather puzzle was never solved inside the boxing ring. He retired with a 50-0-0 record with 27 knockouts. A master at work and one of the best defensive boxers of all time ...