Marquez, Mayweather top list of fighters who may battle Pacquiao next

Manny Pacquiao returned to his corner before the 12th round to an unfamiliar soundtrack of steady boos rising from the MGM Grand Garden crowd.

The fans weren't jeering their beloved Filipino congressman. They were incensed that Sugar Shane Mosley apparently was scared to fight him.

"I told him in the last round, 'You've got to knock this guy out, because it's embarrassing,'" Pacquiao trainer Freddie Roach said. "He told me, 'Coach, I'm trying, I'm trying.'"