Jim Seeley of Prince Georges Country Club won the medal at Washingtonian yesterday for the local U.S. Open golf qualifying trials by matching par 142 over two courses for the 36 holes.

Rain delayed completion of the rounds for an hour and a half, but Seeley's rhythm was not disturbed. He shot par 70 at the National course in the morning and registered par 72 in the afternoon at Country Club course.

Tied for second place at 146 with Mark Wallach of Quenton, Va., was Larry Wise, former Congressional pro now unattached. Wise carded 72 on the National course in the morning ad 74 in his afternoon round. Wallach turned in 71 on the National and then 75 on the more treacherous Country Club (hotel) course.

There were few surprises in the list of 10 eligibles who will play at Manor and Argyle on June 2 in sectional qualifying for the U.S. Open proper at Baltusrol in Springfield, N.J., June 12-15.

Two prominent area names, Marty West and Lee Elder, were not required to play in the local trials. West was exempt because he was a member of the Walker Cup team, but he will have to play in the sectional. Elder is exempt from both because he finished among the first 15 at last year's Open.

The players complained of the slow greens before the storm hit. After it did, the greens were even slower. There were several notable casualties. Among those who did not qualify were Gary Mankulish of Woodmont, Steve Lejko of Congressional, Brian Staveley of Eisenhower and Woody Fitzhugh, a touring pro formerly of Washington Golf and Country Club.

Greg Overton of Springfield was one under par in the morning round at the Country Club course until he drove four balls out of bounds on the 18th, which skirts Rte. I-270, and took an 11 for a total of 78.

Seeley was extremely steady in his morning round on the National course with two bogeys and two birdies. Switching over to the hotel course in the afternoon, he balanced three bogeys with three birdies.

Gary Marlowe, former Maryland Open champion, appeared out of it in the morning round at National when he had six-over-par 76. But he came back on the Country Club course with six birdies and seven bogeys for 73.

Webb Heintzelmen, a Washingtonian member who will be 18 on May 26 and is headed for the University of South Carolina, posted 71 in the morning on the hotel course and 78 on the National course to qualify. Heintzelman was metropolitan junior of the year in 1979.