Manny Pacquiao vs. Juan Manuel Márquez IV, billed as "Fight of the Decade", was a professional boxing match contested on December 8, 2012 at the MGM Grand in Las Vegas, Nevada.

Most ringside observers scored both for Pacquiao on account of his cleaner punches and head movement that prevented Márquez from landing his counters.

The strategy paid off immediately as Márquez feinted again to the body before landing a looping overhand right that floored Pacquiao for the first time in their four fights.

In the final minute of the round, the fighters traded before Pacquiao landed several unanswered punches, including a right hook that buckled Márquez's knees and broke his nose.

With ten seconds remaining, Pacquiao landed a left cross causing Márquez to wildly push him into the ropes.

Márquez darted across the ring, right hand raised, before mounting the corner ropes and being mobbed by his trainer Ignacio Beristáin and promoter Fernando Beltran among others.

Kenny Bayless didn't bother to count as Pacquiao lay on the canvas motionless until he was revived and sat on his stool, two minutes, twenty seconds after going down.

[5] In the immediate aftermath, both fighters praised their opponent, with Pacquiao acknowledging that he "had no excuse and that he (Márquez) deserved the victory."

Márquez lost his opportunity to retire on a high note after losing his next fight to Timothy Bradley, but he then made up for it by defeating Mike Alvarado and retaining the WBO International Welterweight crown.