Manny Pacquiao was already out cold by the time his face planted itself into the canvas last night.

A devastating right hook from Juan Manuel Marquez connected with the 33-year-old's chin in the sixth round of the welterwieght clash in Las Vegas and left Pacquiao motionless in the ring for some time.

It was Pacquiao's second successive loss after his controversial defeat to Timothy Bradley six months ago.

In the fourth match between the Filipino and Marquez, the Mexican had Pacquiao down in the third round.

But Pacquiao returned the favour in the fifth round before Marquez got the vital blow.

And as Pacquaio jaw shuddered, former political heavyweight Mitt Romney's jaw dropped as he watched ringside...