LAS VEGAS (AP) _ Undefeated Sultan Ibragimov, of Miami, Fla., successfully defended his World Boxing Organization Asia-Pacific heavyweight championship with a first-round knockout Friday night of Andy Sample, of Topeka, Kan.

Ibragimov, the silver medalist for Russia in the 2000 Sydney Olympics in the heavyweight class, dropped Sample three times in the first. The bout ended at 2:04 of the round.

The 30-year-old Ibragimov, 216, now has a record of 17-0 with 15 knockouts. The 28-year-old Sample, dropped to 32-11-2 with 21 knockouts.

In an earlier bout, Ibragimov's cousin, Timur Ibragimov, also of Miami, halted Rogerio Lobo, of Las Vegas, with a knockout in the fourth round of a heavyweight bout.

Ibragimov, 222, originally of Uzbekistan, now has a record of 19-0-1 with 11 knockouts. Lobo, 216, has a mark of 34-13 with 29 knockouts.