Juan Manuel Márquez v Manny Pacquiao: fight four - in pictures

Juan Manuel Márquez of Mexico arrives at the MGM Grand Garden Arena in Las Vegas to take on Manny Pacquiao for the fourth time Photograph: Al Bello/Getty Images

A confident Manny Pacquiao, who has won two of the pair's three previous fights (the other was a draw), steps towards the ring Photograph: Al Bello/Getty Images

Pacquiao prays in the ring Photograph: Al Bello/Getty Images

Pacquiao throws a left at Márquez as he sends one straight back at his opponent Photograph: Al Bello/Getty Images

Pacquiao falls to the canvas as Márquez lands a right in the third round Photograph: John Gurzinski/AFP/Getty Images

The Filipino world champion reels on the mat after being knocked down Photograph: Al Bello/Getty Images

Referee Kenny Bayless gestures to Pacquiao as he stands up to continue the brawl Photograph: Steve Marcus/Reuters

Márquez is next to lose his footing, falling in the fifth to this devastating right to the chin Photograph: Steve Marcus/Reuters

As the bout approaches its dramatic finish, Pacqiuao and Márquez exhange a series of furious blows Photograph: Al Bello/Getty Images

Pacquiao lunges in and meets a show-stopping right from Márquez Photograph: Eric Jamison/AP

Manny lies motionless and face down on the canvas and Kenny Bayless calls the fight as Márquez rushes from his corner after knocking out Pacquiao in the sixth round Photograph: Eric Jamison/AP

Fans watching the bout live in Pacquiao's home city, Manila, show their concern Photograph: Jay Directo/AFP/Getty Images

The winner stalks the ring as his opponent lies prone on the canvas after the shocking knockdown Photograph: Julie Jacobson/AP

As Pacquaio gets back on his feet, the fighters embrace in the ring. Manny later admitted: "I was able to come back from the first knockdown but the second one was a really good shot." Photograph: Julie Jacobson/AP

Battered and bloodied, but victorious, Juan Manuel Márquez ackowledges the 20,000-strong crowd at the MGM Grand Arena. "I knew I could be knocked out at any time," Márquez said, "when he was coming at me in those last three rounds, but I threw the perfect punch." Photograph: Eric Jamison/AP