LOS ANGELES - (UPDATED) Brian Viloria stopped Hernan Marquez in the 10th round Saturday to add Marquez's World Boxing Association flyweight world title to his own World Boxing Organization belt.
Filipino-American Viloria knocked down Marquez with a right late in round one and continued to dominate the early rounds.
Mexico's Marquez came alive in the fifth, unleashing a battery of blows, but Viloria weathered the storm and sent Marquez to the canvas again.
"I knew it looked bad but I wasn't hurt," Viloria said. "I knew he was going to get tired."
When Viloria sent Marquez down a third time in the 10th with a left to the head, Marquez's corner threw in the towel and the referee stopped the bout at 1:01 of the round.
"I think my left hook was too fast for him," said Viloria, who had won the WBO title with a victory over Julio Cesar Miranda in July 2011.
Viloria, coming off a technical knockout victory over Mexico's Omar Romero in the Philippines on May 13, stretched his winning streak to six fights since a defeat to Carlos Tamara in 2010.
He took his record to 32-3 with 19 wins inside the distance, while Marquez fell to 34-3 with 25 knockouts.
In an action-packed bout on the undercard, Nicaragua's Roman Gonzalez retained his WBA light flyweight title with a 12-round unanimous decision over Juan Francisco Estrada.
Gonzalez remained unbeaten, taking his record to 34-0 with 28 knockouts.
One judge scored it 118-110 while two others saw it 116-112 in favor of the champion.
Mexico's Estrada fell to 21-2 with 18 knockouts.
With the win, Gonzalez may have given himself a chance to step up in weight and take on Viloria.
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