Bob Arum believes that a fifth fight between Juan Manuel Marquez and Manny Pacquiao is a possibility.

Marquez knocked out the Filipino in the sixth round of their clash in the early hours of Sunday morning but the Top Rank promoter thinks that the fighters could square off for a fifth time.

"If there's a demand for a fifth fight and the fighters want to do it again, what better fight can you make?" said Arum.

"Listen, I don't think there was one person whether on television or here, who saw the fight tonight that wasn't just blown away.

"Everybody accused me of trying to hype the fourth fight. Everybody said 'We don't want to see it any more'. They were the geniuses that write for boxing, but I said it isn't going to be like the first three fights. They're going to throw caution to the wind and that's exactly what happened."

The fight was held at the MGM Grand in Las Vegas.