If Floyd Mayweather is really ending his career Saturday night, as he promised, he went out in style in the building he calls home.<br />In front of a partisan Mayweather crowd of 13,395 at the MGM Grand Garden Arena, where the man nicknamed "Money" has fought his last 12 fights, Mayweather put on a masterful performance, showing the quickness that is his trademark, and making his overmatched opponent miss throughout the fight.<br />With his victory, Mayweather tied Rocky Marciano's longstanding record for retiring undefeated at 49-0.<br />Afterward, Mayweather reiterated his promise to call it quits.<br />"I've been in this sport for 19 years, champion for 18, and you gotta know when enough is enough," he said.
