Manny Pacquiao (L) of the Philippines poses during an official weigh-in ahead of his World Boxing Organisation (WBO) International 12-round welterweight boxing title fight against Brandon Rios (not pictured) of the U.S. at the Venetian Macao hotel in Macau November 23, 2013.



Brandon Rios (2nd R) of the U.S. and Manny Pacquiao (front, 3rd L) of the Philippines pose after an official weigh-in for their World Boxing Organisation (WBO) International 12-round welterweight boxing title fight at the Venetian Macao hotel in Macau November 23, 2013. REUTERS/Tyrone Siu



Manny Pacquiao and Brandon Rios stare at each other after the weigh-in for their November 24 welterweight clash at the Cotai Arena in Macau.




MACAU - NOVEMBER 24: Manny Pacquiao of the Philippines walks into the ring before his bout with Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.



MACAU - NOVEMBER 24: David Bechkam watches Manny Pacquiao of the Philippines fight with Brandon Rios of the U.S. during the 'Clash in Cotai' WBO International Welterweight title bout on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Paris Hilton watches Manny Pacquiao of the Philippines fight with Brandon Rios of the U.S. during the 'Clash in Cotai' WBO International Welterweight title bout on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Manny Pacquiao of the Philippines prays before his bout with Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Manny Pacquiao of the Philippines prays before his bout with Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


Manny Pacquiao, from the Philippines, right, lands a right to Brandon Rios of the United States during their WBO international welterweight title fight Sunday.


MACAU - NOVEMBER 24: Manny Pacquiao (L) of the Philippines walks away as Brandon Rios of the U.S. falls during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


ACAU - NOVEMBER 24: Manny Pacquiao (R) of the Philippines punches Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Manny Pacquiao (R) of the Philippines fights with Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title bout on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Manny Pacquiao (R) of the Philippines punches Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.



Manny Pacquiao (R) wins a 12-round unanimous decision over Brandon "Bam Bam" Rios at The Venetian Macao Resort in Macau,China.


MACAU - NOVEMBER 24: Manny Pacquiao (L) of the Philippines hugs Brandon Rios of the U.S. after their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


MACAU - NOVEMBER 24: Manny Pacquiao of the Philippines celebrates winning against Brandon Rios of the U.S. during their 'Clash in Cotai' WBO International Welterweight title fight on November 24, 2013 in Macau.


Manny Pacquiao of the Philippines celebrates his victory over Brandon Rios of the U.S. during their World Boxing Organisation (WBO) International 12-round welterweight boxing title fight at the Venetian Macao hotel in Macau November 24, 2013. Pacquiao registered a decisive, unanimous decision win against American Brandon Rios to clinch the vacant WBO International welterweight title on Sunday.