Steve Lundquist of the United States established a world record in the men's 100-meter breaststroke in the Tokyo International meet yesterday.

Lundquist, 22, won the event in 1:02.45, .08 seconds faster than the mark he set in Indianapolis in August 1982. Lundquist has a better world time of 1:02.28 pending from the Pan American Games at Caracas, Venezuela, last week.

On the opening day at the Tokyo Olympic indoor pool, U.S. swimmers won 11 of the 14 gold medals.

World-record holder Rowdy Gaines and Carrie Steinseifer won the 100-meter freestyle events. Gaines was timed in 50.25 seconds and Steinseifer went in :57.

Other Americans who won gold medals were Mary T. Meagher (200 butterfly in 2:08.63), Sue Walsh (200 backstroke in 2:15.02), Tiffany Cohen (400 freestyle in 4:14.03), Jeff Kostoff (400 individual medley in 4:29.52), Pablo Morales (200 butterfly in 1:59.64) and Bruce Hayes (400 freestyle, 3:46.53) . . .

In Rome, East Germany completed a first-place sweep of the 15 women's races in the European championships with two more victories, and Italy's newest sports hero, Giovanni Franceschi, scored an upset to win his second gold medal in the men's 200-meter medley.

In the final medal standings, East Germany had 17 gold, 16 silver and five bronze. The Soviet Union was second and West Germany third.