Barry McCarty of Belle Haven sank a 20-foot birdie putt on the 54th and final hole and edged Webb Heintzelman of Washingtonian by one stroke to win his second Washington Area Amateur Champions tournament yesterday at Newbridge. McCarty also won this title (at Marlboro) and the District Amateur in 1980.

McCarty finished with 71--215, while first- and second-round leader Heintzelman shot 73--216. Glen Barrett of Penderbrook and Jim Estes of Bethesda each shot 73--221 to share third place.

McCarty pulled even from a two stroke deficit at the 16th hole when he rolled in a birdie putt from just off the green and Heintzelman three-putted from 70 feet.

Both parred the 17th hole and came to the lake-guarded 18th hole still even. Both hit good drives, and approach shots that found the green.

McCarty played first and sank his putt for 3. Heintzelman's bid from 18 feet missed to the right.

"I was pretty comfortable with the (winning) putt," said McCarty, 25, a law clerk who plans to attend law school in the fall.

"It was the kind of putt I like to hit. It was uphill, about 20 feet, and it broke about an inch. I played it just outside the cup."

Heintzelman had allowed McCarty to pull even by three-putting two holes early in the round. McCarty then opened a two-stroke advantage when he birdied, and Heintzelman bogeyed, the eighth hole.

Heintzelman evened it once again by going par-birdie on holes 12 and 13 while McCarty went bogey-par.

McCarty hit his tee shot into trees and fell two strokes behind again with a double bogey at the par-3 14th hole.

Both made par at the 15th hole, but then came the two-shot swing at the 16th hole that allowed McCarty to square the match again.

McCarty trailed Heintzelman by one stroke heading into the final round after shooting the tournament's best round, a 69, on Saturday.

It remained virtually a two-man tournament yesterday.