Floyd Mayweather, who remains unbeaten, celebrates at the MGM Grand after outclassing Saul Alvarez to seize his WBC and WBA light-middleweight titlesIn a much-anticipated match-up, WBC and WBA light-welterweight champion Danny Garcia faces big-hitting Argentine Lucas Matthysse, who is the favouriteBut heavy swelling develops around Matthysse's right eye and gradually Garcia begins to dominate, eventually retaining his belts via a unanimous decisionMayweather enters the ring flanked by pop star Justin Bieber and rapper Lil Wayne and is booed by sections of the crowd in his adopted home townMayweather dominates from the off, staying clear of Alvarez's often clumsy attempts to land and peppering his rival with incisive shots on the counterWith the wily Mayweather happy to take a breather, Alvarez probably does enough to steal a couple of late rounds on work-rate aloneThere is a sense of anti-climax at the final bell but boxing purists would have been purring at yet another Mayweather masterclassRemarkably, judge CJ Ross scores the contest a draw but the other two give it to Mayweather by healthy margins as the American retains his iron grip on the sportThe 23-year-old Alvarez comes into the contest unbeaten in 43 professional fights and has heavy backing from his compatriots on Mexican independence dayBy the middle rounds Alvarez is looking forlorn and Mayweather begins to land with some more telling shots as the champion's defences become more porousOn the undercard of the biggest fight of the year, Britain's Ashley Theophane is beaten by Pablo Cesar Cano, the Mexican securing a split-decision victory