Defending champion Dave King of Bethesda and Prince Georges country clubs rallied after he bogeyed the first two holes yesterday and shot a 73--145 for a one-stroke lead heading into today's final round of the Washington Area Amateur Champions Tournament at Marlboro Country Club.

King, who started the round three shots behind leader Greg Carpousis of Army Navy, played steady golf on the heavily wooded back nine, shooting it in even-par 37.

"Three bogeys is good on this golf course," said two-time Maryland Amateur champion King, 40, a statistician with the Public Health Service. "There are some real scary shots out there."

Scott Inman of Springfield, who plays on Louisiana State University's golf team, recovered from an opening-round 77 with the day's best round (69) and moved into contention at 146. Doug Monroe of Bethesda (72) and Glenn Barrett of Penderbrook (76) also are tied for second.

Barrett, who hit 16 greens in regulation on Friday as he shot 70, bogeyed holes 15, 16 and 17 yesterday.

Carpousis, who played on American University's team which made the NCAA tournament, suffered a double-bogey on the par-3 third hole and had seven bogeys for a 79. He hit a six-iron shot into the bunker at the third hole and failed to get the ball out of the sand on his second shot. He ended up sinking a seven-foot putt for a 5. Carpousis is tied for fifth place with Dan McAndrews of Columbia (77--148).

Walter Clark, a Suitland Junior High School teacher from Newbridge, topped several of his drives and shot 78 and is alone at 149.

Dan DeRisio of Springfield, who held the lead for most of the day after a front-nine 35 added to an opening round 71, suffered two straight double bogeys on the back and finished at 79. The University of Alabama student culminated his troublesome final holes by three-putting the 18th green. DeRisio is tied with Gary Fox of Robin Dale (75-150).

King made his first birdie at the par-5 seventh hole when he hit his nine-iron third shot four feet from the cup and sank the putt. He parred the ninth hole and was out in one-over-par 36.

King made his second and final birdie at the par-5 14th hole. He blasted his third shot from the bunker and the ball stopped 15 feet short of the hole. He knocked in the putt and overtook DeRisio, who made a bogey 6 after hitting his second shot into water bordering the left side of the hole.