(CNN) - Mitt Romney ended his political battle a month ago, but the former GOP presidential nominee took in a different kind of fight Saturday: a non-title bout in Las Vegas between boxers Juan Manuel Marquez and Manny Pacquiao.
Romney shook Pacquiao's hand before the fight, wishing him success in the match. Pacquiao himself is also a politician, serving as a congressman in his native Philippines. He has endorsed some American politicians, including Senate Majority Leader Harry Reid, a Democrat.
According to a tweet from Greg Bishop, who covers boxing for the New York Times, Romney greeted Pacquiao in the locker room after the bout, telling the defeated fighter: "Hello Manny. I ran for president. I lost."
The fight came to an end 2:59 into the sixth round, after Marquez landed a right hand to Pacquiao's face, knocking him cold late Saturday at the MGM Grand Garden Arena.
Pacquiao went down face-first and lay motionless for a while, possibly unconscious, before eventually sitting up. It was called a technical knockout and Marquez declared the winner.
Pacquiao shook Marquez' hand.
The fight was originally scheduled for 12 rounds. Both fighters scored knock-downs earlier in the fight with Marquez putting Pacquiao on his back and Pacquiao tipping Marquez enough off of his feet to cause one of his gloves to touch the mat.
CNN's Ben Brumfield and Jill Martin contributed to this report.