Mayweather vs. Pacquiao

Floyd Mayweather Jr. in the ring before the welterweight unification championship bout on May 2, 2015 at MGM Grand Garden Arena in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Mayweather vs. Pacquiao

Floyd Mayweather Jr., left, battles Manny Pacquiao during their welterweight fight in Las Vegas on May 2, 2015. (Photo: JOHN GURZINSKI/AFP/Getty Images)

Mayweather vs. Pacquiao