Manny Pacquiao
Floyd Mayweather and Manny Pacquiao embrace following the former's victory at the MGM Grand in Las Vegas.Getty Images

Manny Pacquiao has claimed he was suffering from a shoulder injury in the build-up to his comprehensive points defeat to Floyd Mayweather in the 'Fight of the Century' in Las Vegas.

Filipino welterweight Pacquiao gave a typically spirited performance at times, but was comfortably second best at the MGM Grand as he struggled to contend with his long-time rival's speed and footwork and failed to land too many meaningful blows.

The three judges scored the fight 118-110, 116-112 and 116-112 respectively and many onlookers were left slightly disappointed that 'Pacman' had not been able to trouble the elusive Mayweather throughout the 12 rounds with the lucrative bout having received so much hype.

"Three weeks before my fight I had to skip my training for a couple of days for that reason. We went for an MRI – there is a tear in my right shoulder," the 36-year-old, whose trainer Freddie Roach revealed they thought about attempting to postpone the fight at one stage, before Pacquiao showed signs of recovery, said in the post-fight press conference as reported by Sky Sports.

"I cannot use my right shoulder a lot. The fight was still good. But what we wanted to do, we could not do because of my shoulder.

"The thing is in the third round I already felt the pain in my shoulder. When I threw a lot of combinations I had to back off because it hurt. But he's fast – he's a good boxer. Give credit to him – he won tonight."