CLOVIS, CALIF., JULY 28 -- Amy Shaw of Mission Viejo, Calif., and Steve Bentley of Fountain Valley, Calif., each broke an American record today in the 200-meter breaststroke at the U.S. Swimming Long Course National Championships.

The first four finals in the competition have produced four American records and one world mark.

The last time the U.S. Long Course Championships were held at the Clovis pool, in 1983, four world records and two American marks were set.

Shaw eclipsed the American record twice in one day when she won her final in 2 minutes 29.78 seconds, erasing the mark of 2:30.77 she set in a preliminary heat. The previous mark of 2:31.15 was set at the 1984 Summer Olympics by silver medalist Susan Rapp.

Bentley captured his event in 2:15.30, breaking the mark of 2:15.38 set by Steve Lundquist in 1983.

Winners of other finals tonight were Melvin Stewart, 1:58.13 in the men's 200 butterfly; Melanie Buddemeyer, 2:12.27 in the women's 200 butterfly; Andrea Hayes, 2:12.37 in the women's 200 backstroke; Scott Johnson, 2:01.68 in the men's 200 backstroke; Dara Torres, 56.4 in the women's 100 freestyle, and Matt Biondi, 49.34 in the men's 100 freestyle.