Gary Mankulish, the new Maryland State Amatuer champion, and Doug Ballenger, who won this tournament in 1971, shared the medal with one-under-par 72s in the qualifying round of the Maryland Open Golf championship at Maryland Golf and County Club today.

John Yeagley of Westwood was a stroke behind at par 73. No one else shot below par.

A field of 136 including 55 amateurs, competed and the qualifying cutoff was 80, with 64 players surviving.

The long (7041 yard) course gave both the pros and amateurs a hard time.

Jack Skilling, the 16-year-old Chevy Chase golfer, fires an 80, but would have been among the leaders but for one bad hole. He was out in 37 and back in 43, including a 9 on the par-five 10th.He drove out of bounds, hits a tree and had an unplayable lie on his nest shot. He climaxed his personal nightmare by missing a short putt.

Herb Rose, president of the Middle Atlantic PGA, also had a good score going, but bogeyed the last five holes for a 78.

George Graefe, who won his tournament as an amateur last year but now is a pro at Fauquier Springs, had a creditable 75.

Two strokes begind the leaders were amateur Steve Potter of Congressional and Mark Diley, an assistant pro at the University of Maryland. Ben Brundred III, runner-up to Makulish for the Maryland Amateur title last month, was home with a 79. Bob Benning, the Congressional pro who flew in from Scotland where he was a radio broadcaster for the British Open, got over his jet well enough to shoot a three-over-par 76.

Makulish had his problems on the front nine, coming in with a 39 after bogeys on the second, third and sixth. He was in a bunker on the second and third holes and missed the green on the sixth. But he birdied the fourth when he holed a 60-footer.

He caught fire on the back nine. He birdied the 10th from six feet, the 13th from two feet and the 10th from 10 feet and added five pars for an incoming 33.

Ballenger birdied the par-five first hole when he got on the green in two and two putted. He birdied the sixth from 20 feet to make the turn at two under-par 35.

But he bogeyed the 10th and 17th when he missed the greens. He put a five-iron shot inches from the cup on the 18th for a birdie for his 37.

The field will be cut to the low 35 and ties after Tuesday's round with a final 10 holes on Wednesday.