Renaldo (skeets) Nehemiah ran the 110-meter high hurdles in 13 seconds flat today at the National Sports Festival, easily defeating arch rival Greg Foster and tying his own world record. But a tail wind of 3.41 meters per second rendered the feat ineligible for entry into the record books.

If the first women's marathon run under the aegis of the U.S. Olympic Committee, Laura DeWald, 23, a civil engineer from Arlington and a former tract competitor at the University of Virginia, finished four minutes ahead of her nearest rival.In 1984 the women's marathon will become part of Olympic competition for the first time.

In basketball, the East team, coached by Georgetown's John Thompson, had its record evened at 1-1 with a 94-93 loss to the South on a jump shot by Jim Masters with two seconds to play. The East had taken the lead with a basket by Georgetown-bound Pat Ewing with 11 seconds left. Ewing was fouled, but missed the free throw. Earl Jones of the University of the District of Columbia led the East with 24 points and Anthony Jones, another GU recruit, had 16.

Madeline Manning Mims, an Olympic gold medalist in 1968 and four times a member of the U.S. Olympic track team, set a meet record in winning the women's 800-meter run in 2:01.99 in what she said "is my last race on American soil." Mims, 33, said she will retire from running after competing in the World Cup Games in Rome in September.

Nehemiah, a former University of Maryland track star running for the first time since an injury in May, said that under better conditions he could have broken his record.

Intermittent showers throughout the afternoon made the artificial surface of the track soggy, and when the 110-meter hurdles were run the rainfall had picked up considerably.

"The conditions obviously were not that great," Nehemiah said. "I was bouncing around all over the place. I kind of feel the wind was offset by the rain. On a dry track I could have broken the world's record."

Nehemiah said Foster, who finished in 13.22, had told him he got off to a bad start.

"When I get off to a bad start, I win anyways," said Nehemiah, who by his own description was wiped out by Foster when they ran against each other May 10. "I want, before this year is out, to come as close to a 12.5 as possible," Nehemiah said.

DeWald, who began running marathons only 1 1/2 years ago, finished the 26 miles 365 yards in 2:47.06, breaking the course's women's record by eight minutes. Margorie Kaput of Tuscon was second in 2:51.39.

"There were four girls in a pack ahead of me until about the eighth mile, and I was just a little behind them," DeWald said. "Then I started to gain ground. I pulled ahead at the 20th mile, and I ran a faster second half than the first. I was 1:26 at the end of the first half, and it felt good to be able to do the second half faster."

The marathon course stretched over an area of rolling hills at Onodaga Lake Park on the outskirts of Syracuse.But the hills, DeWald said, were not difficult, "just enough to make the course interesting."

Only 12 women and 21 men ran the marathon here, a vast difference from the thousands who compete in Boston, New York and in the Marine Corps marathon in Washington.

"It was lonely out there," said DeWald, who has run in the Marine Corps marathon and finished eighth among the women runners in Boston this spring with a time of 2:35.57, more than 11 minutes better than her time today.

"It was a little humid out there this morning," said DeWald, who also said she believed the presence of more runners would have motivated her to turn in a faster performance.

Mims, who was captain of the U.S. women's Olympic track team in 1976 and 1980, took the lead early in the 800 meters and staved off a strong last-lap challenge from high school student Kim Gallagher of Upper Darby, Pa.

"I could have done a lot better today but I couldn't get any kind of a grip on the track," Mims said, echoing complaints from many of the competitors here that the new artifical surface is too soft.

James Robinson of Oakland won the men's 800 meters in a meet record 1:47.53. As is his custom Robinson ran back in the pack until near the end then burst to the front.

Bob Roggy, 24, of Eugene, Ore., won the javelin throw at 280 feet 7 inches into the wind on his first try. "That first throw had the power to cut right through the wind," he said.

Rob Carpenter, the Massachusetts schoolboy who was the first-round pick of the Washington Capitals in the NHL entry draft, had two goals in a losing cause as Central beat New England, 8-5, in ice hockey.

James Johnson, a 119-pound boxer from Washington, lost a unanimous decision to national Golden Gloves bantamweight champion Steve Cruz of Fort Worth.