(CNN) -- Manny Pacquiao defeated Joshua Clottey decisively Saturday night to retain his World Boxing Organization welterweight title.

The Filipino fighter, known affectionately as "Pacman" by his fans and in his country, won by unanimous decision. Two judges scored the fight 119-109 for Pacquiao, while a third scored it 120-108, according to the WBO.

Pacquiao has now won 12 straight bouts since losing to Erik Morales in March 2005.

The 12-round decision was a longer fight than Pacquiao predicted before the match. Following his weigh-in, Pacquiao sent a message to his adoring fans that he would be targeting a quick knockout in the fight against Ghana's Clottey.

"I am not going to promise you a knockout, but I will do my best," Pacquiao told the crowd who had gathered to watch the weigh-in Friday night in the Cowboys Stadium.

Saturday's match was fought at Cowboys Stadium in Arlington, Texas, in front of more than 40,000 people. The stadium is the home of the Dallas Cowboys U.S. football team.

Pacquiao, who began his career as a 112 pound flyweight, has won world titles at six different weights and boasts a 50-3-2 record with 28 knockouts.

The fight attracted worldwide attention, particularly back in the Philippines where Pacquiao is a national hero.

Pacquiao was originally slated to be taking on American Floyd Mayweather Jr, in what was billed as the richest fight in boxing history, but a row over dope testing led to negotiations be called off.

The Clottey fight was arranged in its place, but many expect Pacquiao to take on the unbeaten Mayweather later in the year.

Source: edition.cnn.com