Sarah LeBrun began par-birdie-eagle, ended 5 under par for 14 holes and defeated fellow Baltimorean Tina Barrett, 5 and 4, to win the Maryland Women's Amateur yesterday at Chevy Chase Club.

LeBrun, 20, a Duke University junior, lost to Barrett in June in the Baltimore Metropolitan tournament. "It was a motivation, just to prove to myself . . . " said LeBrun, who plays out of Green Spring Club. "I wanted to win this one."

LeBrun's four matches this week all were won by a 5 and 4 margin. The only time she played beyond the 14th hole was in Tuesday's 18-hole qualifying, when she shot 74. After LeBrun made a 10-foot putt for eagle 3 on the third hole, Barrett found herself at even par but three holes down.

LeBrun continued the onslaught by birdieing the sixth hole, and almost eagled the 11th to go 4 up.

"She was too hot today," said Barrett, 20, who plays for Longwood College in Farmville, Va., where she won this year's NCAA small-college championship. "I played good all week Barrett eliminated Western Amateur runner-up Lois Ledbetter in Thursday's semifinals . Sarah played much better than me."

Curtis Cup player Kim Williams of Potomac, a first-round upset victim, opened with three staight birdies and defeated Carol Davies of Argyle, 6 and 5, to win the first flight