MANNY PACQUIAO has insisted he wants another shot at Floyd Mayweather after revealing that a tear in his shoulder almost forced him to pull out of Saturday night's Fight of the Century.

The Filipino had a late request for a pain-killing injection on fight night turned down by Nevada authorities and proceeded to be comprehensively defeated by Mayweather's defensive exhibition at the MGM Grand as the richest fight in history failed to truly spark under the watching eyes of the world.

"Three weeks before the fight I got a tear in my right shoulder. It got better but it wasn't 100%," said Pacquiao, whose request for an anti-inflammatory injection came too late in the day for authortites' approval. "In the third round, I felt pain in the shoulder. We didn't throw a lot of combinations because it hurt. The thing is, what we wanted to do we could not do because of my (right) shoulder."

Pacquiao said he'd like the chance to do it all over again but the nature of the Saturday's fight didn't leave a whole lot of hunger to see the pound-for-pound kings of this generation reconvene in the ring. Apart from a superb salvo in the fourth round and another flurry of combinations in the sixth, Pacquiao struggled in much the same way Mayweather's opponents have for years - laying a glove on the defensive master whose countering rights swayed the judges in the key rounds.

Mayweather avoided talk of a rematch, asking to have time to enjoy his victory, while England's Amir Khan gave ringside reporters the reasons why he feel he should be what is due to be the final opponent of Mayweather's career in September.

The unified welterweight champion of the world revealed that he will relinquish all five of his world titles as early as today, insisting that "it's time for someone else to have a chance". "I'm not greedy," Mayweather added before unfolding and display a Bank of America cheque for $100million, his purse for the super fight.