Karen Smith and Colleen Carney have played tennis against each other before, but never so far from home.

The teen-agers live five minutes from each other in Sydney, Australia. They played in a women's semifinal of the Capital City Tennis Championships in College Park yesterday, with Smith, 17, playing a steadier game to beat her 15-year-old friend Carney, 6-2, 6-2.

"I usually beat her," said Smith, a part-time coach in Sydney. "But it is hard to play against a friend."

Smith will be playing Californian Joan Lebedoff today at noon in the final of the USTA-sanctioned amateur tournament. Lebedoff returned to competition in late April from two foot operations, and has been winning doubles titles on the amateur circuit.

An Arizona University student, Lebedoff defeated Barrie Bulmore of California-Berkeley, 6-4, 7-5.

In men's semifinals, Bryan Gibbons, a recent transfer from Houston to Maryland, where he will be eligible in January, was ousted by David Livingston of UCLA, 6-4, 6-1.

Livingston, who has not lost a set all week, will oppose Richmond's Norman Schellenger, a 6-3, 6-2 winner over Rob Nelson of California-Irvine.