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LAS VEGAS, NV - MAY 02: Floyd Mayweather Jr. (R) throws a right at Manny Pacquiao during their welterweight unification championship bout on May 2, 2015 at MGM Grand Garden Arena in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

LAS VEGAS, NV - MAY 02:  Floyd Mayweather Jr. (R) throws a right at Manny Pacquiao during their welterweight unification championship bout on May 2, 2015 at MGM Grand Garden Arena in Las Vegas, Nevada.  (Photo by Jason Merritt/Getty Images)