Pacquiao put Mosley to the floor in the third round, a moment that proved decisive, but could not finish him off.
“It wasn’t my best performance. I did my best. I did not expect this result,” said the Filipino.
Pacquiao, who relied on a counter-punching approach against Mosley, took the fight 119-108, 120-108 and 120-107 on the cards.
Mosley added: “I fought the best fighter in the world. He has exceptional power, power that I’ve never been hit like this before.”
Meanwhile Mike ‘The Rebel’ Perez took his professional boxing career to a new level on Saturday night when he battered his way to win the first International Prize Fighter event at the Alexander Palace in London.
The 25-year-old Cuban southpaw won all this three fights, two inside the distance, to maintain his unbeaten professional record. He is the first of three former world junior championships to base themselves in Cork and now finds himself among the most promising heavyweights in the division.
The performance stunned the Sky boxing pundits. Former world champion, Barry McGuigan, insisted the Cork-based Cuban has the potential to be a world class fighter.
“He’s really got it,” he said.
“He’s got fantastic physique. He’s not a huge heavyweight. He’s got tremendous potential. This was a big victory for him. It was very predictable because we knew he had amateur credentials. He was very determined and he really wanted to win this.
“He’s been around in Ireland for quite a long time and all the internet sites have been talking about him but what Prizefighter and what Sky have done tonight more than anything else is they’ve given him exposure.”
Perez immediately threw down the gauntlet to all and sundry insisting he was ready for a world title shot.
“I feel good, I feel great,” he said.
“I was definitely getting better as the tournament went on. There was too much pressure in the first fight.
“Hopefully after that I will get a shot at a world title maybe tomorrow — David Haye, Vladimir Klitschko anyone in the world at the moment.”
Perez was ruthless in all his contests although his opening bout with 18 stone Kerston Manswell, went to the judges.
French heavyweight champion, Gregory Tony, standing 6’5” and weighing 16st 3lbs, lasted less than a minute as Perez had him on the floor with a multi-punch combination to the head within seconds of the opening bell. To compound his predicament Tony appeared to injure his left shoulder in the fall.
Perez was on him straight away and put him down with another left hand to the head and, when hostilities resumed, it took just one more punch from Perez to finish him off.
On the other side of the draw Tye Fields, the oldest man in the tournament at 36, standing 6’8” and weighing 19st 5lbs, won a split decision over Michael Sprott. But the big American, now based in Canada, would survive less than a minute against Perez who now had the crowd behind him.