FILE - Manny Pacquiao from the Philippines wears the champion's belt after defeating Brandon Rios of the United States in their WBO international welterweight title fight Sunday, Nov. 24, 2013, in Macau. Pacquiao defeated Rios by unanimous decision. (AP Photo/Vincent Yu, File)

FILE - Boxer Michael Nunn is lifted in triumph after defeating Donald Curry in an International Federation middleweight title in Paris, Oct. 18, 1990. (AP Photo/Lionel Cironneau, File)

FILE - Manny Pacquiao, right, throws a right to Adrien Broner in the WBA welterweight title boxing match Saturday, Jan. 19, 2019, in Las Vegas. (AP Photo/John Locher, File)

FILE - WBC lightweight champion Manny Pacquiao, right, connects with Oscar De La Hoya during the sixth round of their welterweight boxing match in Las Vegas, Saturday, Dec. 6, 2008. (AP Photo/Mark J. Terrill, File)

FILE - In this Aug. 23, 1996 file photo, boxer Vinny Pazienza, of Providence, R.I., is lifted up after winning a 12 round WBU super middleweight title bout against Dana Rosenblatt in Atlantic City, N.J. (AP Photo/Bill Borrelli, File)

FILE - Vinny Paz, five-time former world champion boxer, smiles as he weighs in Thursday, July 26, 2001, in Cranston, R.I., for his fight against Irish Pat Lawler. (AP Photo/Victoria Arocho, File)

FILE - Manny Pacquiao fights Adrien Broner, not pictured, in a welterweight championship boxing match Saturday, Jan. 19, 2019, in Las Vegas. (AP Photo/John Locher, File)