Mike Bruner, the 23-year-old Olympic champion competing out of Mesa, Ariz., under former Canadian Olympic Coach Bill Rose, won his second event of the national swimming championships tonight with a victory in the 400-meter freestyle.

Tracy Caulkins also became a double winner.

Bruner pulled away from American record holder Brian Goodell of Mission Viejo, Calif., at the 250-meter mark and held off a strong finish by 800-meter champ Djan Madruga of Mission Viejo to record a 3:52.24. Madruga, 21, was second in 3:53.91 and Goodell, 21, third in 3:55.61.

Goodell holds the American mark of 3:51.56, while the world standard was set earlier this year by Vladimir Salnikov of the Soviet Union in 3:51.2. Bruner, who also won the 200 butterfly, had splits of 56.61, 1:55.27, 2:53.87, 3:52.24.

Caulkins won the 200-meter individual medley in 2:14.73. Cynthia Woodhead of Riverside, Calif., was second in 2:17.39.

In the new glamor event, the 50-meter freestyle, Jill Sterkel of Long horn Aquatics recorded a 25.96 to break the U.S. mark she set in the prelims.