Mark Jansen of Fairfax said he does not prefer close golf matches, but in the recent 54th Frank Emmet Schoolboy Championship, he escaped from numerous nerve-wracking situations to win the tournament at Country Club of Fairfax.

Jansen, 17, who recently graduated from Robinson High School and is bound for George Mason University on a partial golf scholarship, won a close quarterfinal match over Matt Carlin, 2 up. He then trailed late in each match but managed victories over Hunter Albright of Langley in the semifinals and Wally Coulther of McNamara in the championship.

"I don't like close matches, but I'll take them if I win them," said Jansen, after he won the final two holes to edge Coulther, 1 up. Jansen sank winning putts of 90 feet on the 10th hole and 50 feet on the 17th.

Against Albright, Jansen had to sink a testing six-foot putt on the 18th green to force the match into extra holes. On the second extra hole, Albright had only to sink a three-foot par putt to put Jansen away. The ball rimmed the hole, spun out and Jansen won on the 21st hole after Albright drove into a hazard.

Jansen, after his biggest win (he was third in the South Atlantic Junior), plans to play in most of the summer tournaments on the area junior circuit.

Coulther, 18, of Fort Washington, was playing in one of his last junior events. Headed for the University of Maryland to play under the tutelage of coach and excellent player Fred Funk, Coulther looked to be the likely Schoolboy victor. Against Jansen, he had a 20-foot putt for birdie on the 15th hole. If he had sunk that, he would have had a 3-up lead. Instead, he three-putted, lost the hole, left the green only 1 up and eventually lost the match.

Coulther said he may have gotten tired down the stretch. He drove into the rough on his final three holes, losing two of them. But Coulther, who plays out of Tantallon Country Club, is a quality player with a good swing, and winning last year's South Atlantic Junior proved that.

Buddy Peoples of Crofton will defend his title in the Washington Metropolitan Golf Association Men's tournament today through Sunday at Bretton Woods . . . Kim Williams of Potomac, in her first year on the LPGA tour, finished with with two straight 69s and won $3,930 in the recent Rochester Invitational. Williams won an automobile for scoring a hole-in-one in an earlier tournament . . . Marian Sison of Arlington, 15, shot 7-under-par 66 to break the Glenn Dale Golf Club women's course record recently. The following day she shot 67, missing a two-foot putt on the final hole. The previous Glenn Dale women's record was 69, held by 12-time club champion Jane Bostrom. This year Sison won the Merrill-Lynch Junior shootout at TPC at Avenel, and the University of Maryland Junior Classic. Last year she won the Junior Tournament of Champions and the Middle Atlantic Junior. Sison, also an excellent tennis player, attends school in Florida at Boca Raton High so she can concentrate on golf . . . The second Prince George's Hospitals golf and tennis tournament will be at Lake Arbor on July 27. The tournament goal is to raise $50,000 for the Prince George's Hospital Center's shock trauma unit and the Greater Laurel Beltsville Hospital's emergency services department.