Sally Voss of Congressional moved closer yesterday to retaining her Women's District Golf Association championship at Springfield Country Club, but is expected to face her strongest challenge today in a semifinal match aginst Carol Davies of Washingtonian.

Voss gained the round of four by defeating her longtime junior partner, Woodmont's Tina Marlowe, 7 and 6, while Davies was disposing of Pam Smyth of Congressional, 5 and 4.

In the other bracket, Chris Epperly of Army Navy, joint medalist with Davies, had an uphill battle to beat Congressional's Pat Thurner, 3 and 2, while Betty Looney, a two-time champion, upset Army Navy teammate Nancy Hollenbeck, 2 and 1.

Voss and Marlowe were roommates at the National Girls Junior Championship in San Diego a few years ago and have known each other since they were tots.

But Voss, who averaged 225 yards a drive, was relentless in besting Marlowe yesterday. She was never headed after winning the first hole with a par. Voss was 5 up after seven holes and made the turn with the same lead. She went 6 up at the 10th and won the 12th with a par to finish Marlowe, a University of Maryland junior. Voss, a recent graduate of Stanford University who will enter medical school in September, was even par for 12 holes.

Thurner was 1 up after nine holes but Epperly came back with three birdies to defeat the Congressional club champion.

Davies was 2 up after nine, then won the next two holes. The 12th was halved, Davies won the 13th with a par and tied the 14th to close out the match.

Looney, a steady player with a fine short game and a great putting touch, had a 2-up lead after nine over the erratic Hollenbeck, who has qualified for several national amateur tournaments. Looney won the 10th but lost the 11th and 13th, won the 14th with a par and halved the next three holes for victory. CAPTION: Picture, Defending champion Sally Voss encourages birdie putt to drop during WDGA quarterfinals. It didn't. By Lucian Perkins - The Washington Post