Chris Anderson, a former captain of the University of Virginia golf team now living in Wilmington, Del., made seven birdies and shot a 3-under-par 68 at Poolesville yesterday to lead four qualifiers for the Kemper Open.

They will join the field of 146 that begins play in the PGA event Thursday at Congressional Country Club.

Amateur Brian Lehnhard was next at 69, followed by Jon Corliss of Virginia Beach and Evan Schiller of Ardsley-on-Hudson, N.Y., who shot 70.

Corliss and Schiller survived a six-man playoff among those who shot 70 for the final two spots in the Kemper field. The playoff losers were Richard Stallings of Sarasota, Fla.; Charles Taylor of Richmond; Mark Carnevale of Williamsburg, and Rick Schuller of Fairfax.

Corliss and Schiller both went par-par on the two playoff holes. Schuller fell out of the playoff along with Carnevale with a bogey on the first hole. Stallings and Taylor bogeyed the second playoff hole to lose their chance.

Anderson, now working as an assistant pro at Bidermann in Wilmington, qualified for the PGA Greater Greensboro Open in 1985. He will try for his tour card this fall.

Lehnhard is a junior at the University of South Carolina. He won the Virginia Junior and Virginia High School championships when he attended Stonewall Jackson High.

Bill Murphy, Max Micklitsch, Phil Sendal and Mike Woodard shot net 47 to win the 14-hole scrambles Am-Am Tournament on Congressional's gold course for amateurs competing in today's Pro-Am.

Jim Thorpe, formerly of Falls Church and now living in Buffalo, N.Y., officially withdrew from the Kemper Open yesterday. Thorpe notified PGA Tour headquarters in Ponte Vedra, Fla., that he was withdrawing from the Kemper and next week's Westchester Classic in New York. No reason was given.