Manny Pacquiao of the Philippines celebrates his unanimous decision victory over WBO welterweight champion Timothy Bradley of the US during their title fight at the MGM Grand Garden Arena in Las Vegas, Nevada April 12, 2014. [Photo/Agencies]

LAS VEGAS - Manny Pacquiao won a unanimous decision in his rematch with Timothy Bradley on Saturday, avenging his 2012 loss and claiming the WBO welterweight title.

Pacquiao (56-5-2) pursued and peppered the previously unbeaten Bradley around the MGM Grand Garden ring with an aggressive performance recalling the Pacman in his prime. Bradley fought back with counterpunching and elusiveness, but Pacquiao kept up his attack while Bradley (31-1) struggled in the closing rounds.

Pacquiao left little doubt about the result of the rematch in the same arena where they met nearly two years ago. Bradley's split-decision victory astonished most ringside observers, who felt Pacquiao had earned a clear decision.

"I knew I had to do more in this fight than I did in the last fight," Pacquiao said.

Judges Craig Metcalfe and Michael Pernick scored the rematch 116-112 for Pacquiao, while Glenn Trowbridge favored the Filipino congressman 118-110. The Associated Press scored it 116-112 for Pacquiao.

After the fight, Bradley said he injured his right calf early on. But he also applauded the decision when it was announced, and he congratulated Pacquiao in the ring.

"I tried, I really tried," Bradley said. "I wanted that knockout. Manny is a great fighter, one of the best in the world. I lost to one of the greatest fighters in boxing. I kept trying to throw something over the top. That's what we worked on in camp. That was the plan, but Pacquiao has great footwork."

Pacquiao landed 35 percent of his 563 punches, while Bradley connected with just 22 percent of his 627 blows. Pacquiao's jab was much more effective, landing 23 percent to Bradley's measly 11 percent, and the Pacman had a slight edge in landing 148 power punches to Bradley's 109.