Tom Walsh of Montgomery Village made par-3 on the second hole of a playoff with Webb Heintzelman of Washingtonian and won the qualifying medal for the 61st Maryland State Golf Association amateur championship today over Woodmont Country Club's tough North Course.

Both had finished with 73, one over par, in a big qualifying field of 160 golfers who competed for the 31 available spots in match play that begins today. Defending champion Gary Marlowe of the host club was an automatic qualifier. Marlowe played a practice round in which he said he had trouble concentrating and shot 77.

Heintzelman, an upcoming sophomore who plays on scholarship at the University of South Carolina, experienced a rocky front nine of 39. The first nine included a bogey on the sixth hole and a double bogey on the seventh, where he took two shots to get out of a sand trap. Heintzelman came back in two-under-par 34, with birdies at 13 and 15.

Walsh, who sells apparel and other golf-related items to pro shots, was 36 on the front nine and 37 on the back.

Safely in the qualifying fold at 76 for the start of today's match play were four-time winner Marty West III of Columbia, two-time champion Dave King of Bethesda and Prince Georges and 1973 Maryland Open champ Henri deLozier of Columbia.

Marlowe, 22, who at 19 became the youngest ever to win the Maryland Open, said his best of an estimated 3,000 rounds he has played here was a 64 a few years ago.