LAS VEGAS (AFP) - Manny Pacquiao insisted he believed he'd beaten Floyd Mayweather after his unanimous points defeat here on Saturday.

"I thought I won the fight, he didn't do nothing," Pacquiao said after the defeat.

Most judges and experts had Mayweather a comfortable points victor.

Ringside judge Dave Moretti scored the bout 118-110 for Mayweather, while judges Glenn Feldman and Bert Clements both scored it 116-112 for the American.

Pacquiao fell to 57-6 with two drawn, never able to mount the kind of sustained aggressive attack he needed to earn the decision.