Cindy Davis of Prince Georges Country Club completed a "slam" of the three major area women's golf tournaments by shooting 73 yesterday at Congressional's Gold Course to win the Middle Atlantic Golf Association women's championship for the third time in four years..

Davis, who also won the Maryland State Golf Association women's amateur and the Women's District Golf Association championship this season, had a 36-hole total of 146 to beat 16-year-old Sarah LeBrun of Baltimore's Green Spring Valley, who shot 74 yesterday and finished at 150.

Davis's main challenger throughout the afternoon was Jane Abood of Kenwood, who started the day two strokes behind, narrowed the margin to one after a front-nine 36 and stayed close. Abood had several opportunities to pull even with Davis, but the putts never dropped.

Abood finally fell two strokes behind when she three-putted the 16th hole. She then double-bogeyed the 17th hole to fall out of the chase and finished third at 76--151.

Michelle Mackall, Washingtonian, was fourth at 77--153, followed by Arlene English, Congressional, 77--154.

"It was my goal at the beginning of the year to win all three tournaments," said Davis, 21. "I was nervous. I started playing sloppy out there and playing defensively."

Bogeys at the seventh and 10th holes left Davis vulnerable, and Abood appeared poised to pull even at the par-3 11th hole when she hit her tee shot six feet from the hole and Davis found the fringe 25 feet from the cup. But Davis sank her long putt, Abood missed hers and the margin was again two strokes.

Davis three-putted the next hole to reduce her margin to one, but played the last six solidly and completed her performance by knocking her tee shot on the par-3 finisher six feet from the hole and making birdie deuce.

Davis intends to turn professional and try for the LPGA tour after she graduates from Furman next spring, where she plays No. 1 on the women's team.

Having won these events, plus being the second low amateur in the U.S. Women's Open and placing second in the NCAA tournament, gives her a shot at making the Curtis Cup.

For Abood, who will try for her LPGA card in October, the key was the three-putt green at the 16th hole. Her effort from 20 feet above the hole slid five feet past and she missed coming back and fell two back.