EL PASO, Texas (AP) _ Irene Pacheco retained his IBF world flyweight title Friday night with an 11th round TKO of challenger Pedro Pena.

Pacheco (24-0-0), who won his 13th consecutive fight by knock out, was in a close fight with Pena (16-1-0) before sending the Los Angeles native to the canvas midway through the 11th round with a left hand to the chin.

Pena continued, but was sent to the canvas again by a Pacheco combination. This time, referee Robert Gonzalez stopped the fight at 2:32 of the 11th round.

Pena, suffering from exhaustion, lay in the ring for about 10 minutes before he got to his feet and left the ring under his own power.

Pacheco, who makes his home in Arbolete, Columbia, was making his U.S. boxing debut and fought for only the second time in his career away from Columbia.

Pacheco took control of the fight in the middle rounds after staying away from Pena, the International Boxing Federation's second-ranked contender coming into the fight, for much of the early going. The knockout was Pacheco's 19th.

This was the second title defense for Pacheco after capturing the vacant IBF flyweight title with a ninth-round TKO of Peru's Luis Cox last April. Pacheco successfully defended his title for the first time last August with a fourth-round knockout of Tunisia's Ferid Benjedou.

In the semi-main event, heavyweights Ross Puritty (26-13-2) and Frankie Swindell (37-18-2) fought to a 10-round draw. One judge scored the bout 97-93 for Puritty, one judge had it 96-94, for Swindell while the third judge scored the fight even, 95-95.