Prime Minister Hun Sen has ripped into the judges of Sunday’s “fight of the century” between Filipino Manny Pacquiao and American Floyd Mayweather, slamming the result as “unbelievable” and questioning the US ring judges’ bias.

At the opening of a road in Pursat yesterday, the premier labelled the result “too bad” and expressed dismay that the victory was given to Mayweather.

“It was brilliant, my best friend,” he said sarcastically, referring to the United States.

“The whole world reacted, and it was not a small reaction; it was so big because Floyd [Mayweather] was always running and protecting, but Pacquiao always beat him into the corner of the ring.”

“I clearly know about the US now,” he later added. “Before, I knew about the US, but not like [today].”

All three judges unanimously gave the 12-round bout to Mayweather, with two scoring the fight at 116-112 in the American’s favour, and another 118-110.

Mayweather fought defensively, constantly evading the notoriously fast and aggressive Pacquiao, but nevertheless landed 67 more punches, according to the Guardian newspaper.

“I would like to send a message to the US judges: please give an explanation as to why Floyd won,” the premier added. “Please make a slideshow.”

US embassy spokesman Jay Raman declined to comment on the premier’s remarks.

Hun Sen has been fond of remarking during his career that “international standards exist only in sports” when faced with criticisms on issues such as human rights or democratic governance.