This Saturday, Floyd Mayweather will defend his welterweight title at the MGM Grand Garden. It's not expected to be a hard fight. In fact, Mayweather chose his opponent, which is, says British boxing writer, Kevin Mitchell, very typical of the expanded and dominant role Mayweather is now playing in boxing. No one has been so dominant, he adds. So why is Mayweather so dominant? What is the secret of his success?