BARTLESVILLE, OKLA., AUG. 1 -- Greg Louganis earned his second gold medal of the U.S. Diving Outdoor Championships, winning today's 10-meter platform competition with 657.12 points.

Defending 10-meter national champion Matt Scoggin, 23, of Great Falls, Va., was second with 628.41 points, although he, like Louganis, qualified for the Pan Am team.

"This was a good competition because I had to rise to the occasion," Louganis said. "When I saw Matt getting 9s on his dives, I thought, 'Gosh, I have to get 9s.' It put the pressure on me. I was thinking that I needed 9s on my last dive, but they told me later that 6.5s would have been enough."

In the women's 10-meter platform, Mary Ellen Clark, 24, of Newton Square, Pa., won her first national title in senior competition. Michele Mitchell was second. Both qualified for the Pan Am Games.

Mitchell, 25, led comfortably most of the way and seemed about to win her seventh straight women's national platform title. But on her next-to-last dive, she spun out of control on a back 1 1/2 somersault with 3 1/2 twists. The crowd gasped as she flopped into the water. The meet referee declared it a failed dive, and Mitchell said it was the first of her career.

"I have no idea what happened," she said. "I just got lost for some reason. When I hit the water, I guess the realization that I might not make the Pan Am team ran through my mind."

Clark is a graduate student at Ohio State.

"I was 12th in the prelims and I had nothing to lose and everything to gain," she said. "I was having fun."