Four Philadelphia fighters won their respective bouts at the USA National Championships in Denver yesterday.

Three of the victories came in the junior male division.

Donald Smith decisioned Victor Lorena, of Winter Haven, Fla., 4-2, in a 106-pound clash.

Damon Allen posted a 5-3 decision over Jeremy Longoria, of Corpus Christie, Texas, in a a 125-pound bout. And, Lamar Richards won on a walkover over Robert McCarthy of Forked River, N.J.

Smith and Allen both fight out of the Mitchell Allen Gym in West Philadelphia.

In a senior male bout, Miguel Cartagena, who boxes out of the Front Street Gym, decisioned Marco Rangel, of Scottsdale, Ariz., 15-9. *