Woodmont pro Bob Boyd completed his merciless march through the Maryland Open with a 64 for a record 54-hole total of 13-under-par 197 and a nine-shot victory yesterday at Bretton Woods.

Tom Gross of TPC Avenel, after reducing Boyd's lead to three strokes on the front nine, finished second. In another tournament, Gross's rounds of 68, 69 and 69 might have won, but not against straight-shooter Boyd in the 70th staging of this event.

Boyd won $2,100 and Gross picked up $1,400.

Marty West of Rockville parred the first playoff hole and defeated fellow Columbia Country Club golfer Richard Holland of Washington for low amateur honors after they tied for third at 209. West, who started the day tied with Gross four shots behind Boyd, shot 72 and Holland one-under-par 69 yesterday.

Mark Long of University of Maryland (68 yesterday) and Dennis Winters of Prospect Bay (71) were next at 210.

It had been the 34-year-old Boyd's show since a second-round 62 Tuesday. He did not make a bogey since his opening 71, and although he experienced a rarity by failing to hit his final green in regulation, he chipped up and made his four-foot putt for par.

"I played well," Boyd said. "I hit 49 of 54 greens and that's a lot of birdie putts. It's encouraging. When you hit that many greens, you can't play but so bad."

A native of Wilmington, N.C., Boyd tore up the Carolinas PGA section in 1988 and 1989. He was named player of the year there twice and in 1988 won a the National Club Pro tournament.

Fellow players may hope Boyd returns to the PGA Tour, where he played briefly in the early '80s with a sixth-place tiein the 1983 Houston Open his best showing. He said there's no chance of that.

"I gave it my best shot," said Boyd, who lives in Gaithersburg. "After that I said I'd let that part of my playing aspect go."

With that, Boyd looked at his watch and said, "I've got to get back to work this afternoon."

The University of Maryland graduate made his presence felt in the Washington area immediately after replacing the retired Tony Marlowe at Woodmont this winter. He qualified for the Kemper Open, played in his fourth U.S. Open and trampled the field here. He is set to play in his fourth PGA Championship, in August.

Baltimore native Gross started the day four strokes back and made three early birdies but did not dent Boyd's lead. Gross missed the ninth green, chipped up and took bogey. Boyd came by the same hole minutes later and slam-dunked a 30-foot birdie putt for a five-shot lead.

"I wish I was playing with him," said Gross, second-year Avenel teaching pro. "I was three under going into nine, but when I heard he was also three under, it kind of took the wind out of my sails." Bowers Junior:

After winning his morning round, boys 16-17 medalist Jimmy Flippen kept with tradition by losing to Troy Ferris in the quarterfinals of the tournament at Springfield. No medal winner has won the title in the tournament's 16 years.

Ferris will face Andrew Trotter in this morning's semifinals, the winner to play the 1 p.m. final against the winner of the Pete Vartabedian-Jim Cangiano match.

In the 14-15 division, Ken Kuhler, who Tuesday defeated medal winner Bill Reid, lost his morning round to Mike Asherhoff, who in turn lost to Kahn Li.

Defending girls division champion Lisa Biernot struggled to a quarterfinal victory over Jennifer Kellogg, coming from two down with four holes remaining. Biernot won the 18th to tie and parred the 19th to win over Kellogg's bogey. She plays Lee Shirley this morning.

Medalist Heather Bowie breezed over Jennifer Harvison, 7 and 5, and will face Danielle Fino in the semifinals.