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Floyd Mayweather Jr.improved to 43-0 with a unanimous decision over Puerto Rico's Miguel Cotto (37-3) on Saturday night at the MGM Grand Garden Arena. Mayweather, who is 35 and facing a June 1 jail sentence on a domestic violence case, remains in line for a super-fight against Manny Pacquiao after serving his time. Cotto was trying to revitalize himself following the hard-handed loss to Antonio Margarito in 2008, a knockout loss to Pacquiao in 2009 and the death of his father, Miguel Sr., in 2010. He avenged the loss to Margarito in December, but could not overcome his unbeaten opponent on Saturday. The scoring by the judges: Robert Hoyle, 118-110; Patricia Morse Jarmon, 117-111; Dave Moretti, 117-111.