LAKE TAHOE, NEV., AUG. 11 -- Pernell Whitaker knocked out Juan Nazario with a short, chopping left late in the first round tonight and added the World Boxing Association lightweight title to the International Boxing Federation and World Boxing Council crowns he already held.

The scheduled 12-round bout before 5,500 fans outdoors at Caesars Tahoe ended with dramatic swiftness.

The left-handed Whitaker (23-1) was moving backward when he suddenly shot a right jab to Nazario's face and followed with a chopping left that dropped the Puerto Rican for a 10 count.

When referee Mills Lane reached a count of about six, he stopped briefly to wave Whitaker back into a neutral corner.

Nazario (23-3) still could not beat it up, and Whitaker was the winner at 2:59 of the round.

"What you see is what you might not get," Whitaker, who has often been criticized for being too cautious, said before the fight.

In a match to determine the World Boxing Organization's junior welterweight championship, Hector "Macho" Camacho scored a 12-round decision over Tony "The Tiger" Baltazar.

Baltazar's best round was the third when he landed several solid left hooks to the body. Camacho then took total command of the fight in the next two rounds, spearing Baltazar with jabs and pepppering him with crisp combinations.

Camacho, who weighed 140 as did Baltazar, came close to ending it in the 10th. He hurt Baltazar with five straight right jabs and a left to the head early in the round.

He then let Baltazar, 29, off the hook, but put him back on it with 30 seconds left when he had him reeling from a six-punch barrage to the head.

Camacho ran his record to 40-0 with 17 knockouts.