Doug Trenor of Dumfries, Va., birdied the 17th hole and scored a 2-and-1 victory over former area player Brian Grimes of Stillwater, Okla., to win the ninth Bobby Bowers Junior tournament yesterday at Springfield Golf and Country Club.

Clare Dolan of Gaithersburg, 16, runner-up the last two years, shot one over par and defeated Margaret Platt, 6 and 4, to win the girls title. Dolan lost in the semifinals of the recent Maryland Women's Amateur.

Trenor, whose drives were exceptionally straight in winning two matches yesterday, had a two-hole lead until the long-hitting Grimes, who used to live in Rockville, birdied the 16th hole to reduce the lead to one. On the par-four, 316-yard 17th hole, Trenor hit a nine-iron for his second shot and the ball stopped five feet from the hole. Grimes scrambled to a par by sinking an eight foot putt, but Trenor ended the match by making his birdie putt. Trenor was two over par in the final.

Trenor, 17, defeated Springfield's John Screen, 4 and 3, in his morning semifinal, and Grimes beat Bruce Willette of Roanoke in 19 holes.

Trenor, who has taken one lesson in four years of playing golf, has practiced furiously. At Montclair, his family pays a flat fee for unlimited access to the driving range, where he usually hits three or four buckets of balls a day.

"Everybody says my swing is flat, but it doesn't make any difference to me," he said. Trenor, who said driving accuracy is the strongest part of his game, does not hit the ball far, but said his game would probably suffer if he tried to achieve more distance.

He led Grimes, 2 up, after nine holes. Grimes reached the par-five 14th hole in two shots and two-putted for birdie to pull within one. Trenor responded with a winning birdie on the following hole. At 16, Grimes hit a beautiful approach shot and won the hole with a two-foot birdie putt to pull within one again, before Trenor clinched the match at 17.

Mike Watson of Rockville beat Andrew Pitts of Hildebrand, N.C., 3 and 1, to win the 14-15 title. Jeff Greenberg of Midlothian, Va., beat Tom Iredell of Rockville, 1 up, to win the 13-and-under.