Michael Moorer retained his World Boxing Organization light-heavyweight championship Saturday night with an eighth-round technical knockout of Danny Stonewalker.

The referee stopped the bout 11 seconds into the eighth round at the Civic Arena after Moorer knocked Stonewalker down to one knee with a right to the stomach. Moorer, who weighed 175 pounds and is from nearby Monessen, Pa., had knocked down Stonewalker, 174, twice in the seventh round. The first knockdown came midway through the round and the second was seconds before the bell.Moorer, 23, raised his record to 22-0; every victory is by a knockout. Stonewalker, 29, the Canadian light-heavyweight champion from Fort McMurray, Alberta, drops to 15-6-1.

Moorer, a southpaw, knocked Stonewalker down midway through the first round with a left jab. Stonewalker also slipped to the canvas in the second round.

Moorer landed a punch in the fifth round that opened a cut on the bridge of Stonewalker's nose.

It was the first championship fight in Pittsburgh since heavyweight champion Larry Holmes knocked out Renaldo Snipes at the Civic Arena in November 1981.