Californians Matt Biondi and Janet Evans built up their medal hoard with another gold apiece Thursday night, swimming to astonishingly easy, record-breaking Olympic victories.

Biondi, winner of two golds, a silver and a bronze, needs three more medals to become the first Olympian to capture seven in one Games since Mark Spitz' all-gold feat of 1972.Biondi, the world record-holder in the 100-meter freestyle in 48.42 seconds, set an Olympic record of 48.63 in his specialty, while fellow American Chris Jacobs won the silver in 49.08. Stephan Caron of France won the bronze in 49.62.

Biondi, 22, of Moraga, Calif., held the old Olympic mark of 49.04, set earlier in the day in the preliminaries.

Evans, who won the 400 individual medley earlier in the week, churned through the 400 freestyle in 4 minutes, 3.85 seconds, lowering the world mark of 4:05.45 she set last December.

When she saw the time flash on the scoreboard, her eyes popped wide and her mouth opened in disbelief.

Heike Friedrich of East Germany won the silver in 4:05.94 and East German Anke Moehring took the bronze in 4:06.62.

Evans, 17, of Placentia, Calif., beamed broadly on the victory stand, waved to the crowd, and sang the Star Spangled Banner while the American flag was raised. Moments later, Biondi did the same.

Kristin Otto of East Germany won her second gold, taking the 100 backstroke in 1:00.89.

Peace, harmony, progress - the theme of the 1988 Olympics posted all over Seoul - lost some meaning earlier in the day when enraged Korean boxing coaches punched a referee and gave the Games a nasty black eye (See related stories this page).

The chaos and disgrace at the boxing arena cast a shadow over a day of perfect 10s by Soviet men gymnasts, speed and hustle by American women in a basketball shootout, and a dramatic comeback victory by the defending gold medal U.S. men's volleyball team.

Even Libyan leader Col. Moammar Gadhafi chipped in from afar with some criticism, citing bullfighting as one of the Olympics' violent and brutal sports.

The boxing fracas stole some of the thunder from a victory by American 119-pounder Kennedy McKinney, who knocked down Erick-Giovanni Perez of Guatemala twice and stopped him at 1:44 of the first round.

On the fun side of things, Jeff Stork came off the bench to rally the defending gold medal U.S. men's volleyball team from an 0-2 deficit to a 3-2 victory over Argentina that virtually clinched a spot in the medal round.

Stork, the usual starting setter, sat out the first two games with a back injury, then turned the match around in the third game with his spinning, dipping, left-handed serves.

He won his first five points, one on an ace that made it 9-4, and got fine support from Steve Timmons, Craig Buck and Bob Ctvrtlik to win the match 11-15, 11-15, 15-4, 17-15, 15-7 and run the U.S. record to 3-0.

In women's basketball, the United States fell behind Yugoslavia by eight points before its running game and trapping defense kicked into high gear. Then it was goodbye.

The Americans became only the second women's basketball team in Olympic history to top the 100-point mark, winning 101-74. The only other women's team to score 100 was the Soviet Union, which beat the United States 112-77 in 1976.

"Naturally, a coach would like to have a strong start, but you'd rather have a stronger finish," Coach Kay Yow said. "You just go with the flow. That's this team's personality. I don't feel you can force something on a team just because that's what I would want to do."

With a 2-0 record and only a Sunday game against China remaining in pool play, the United States is assured of getting into the medal round.

The Soviets, as expected, dominated men's gymnastics as Vladimir Artemov captured the all-around gold to lead a sweep of all three medals.

Artemov, 23, outlasted teammates Valery Lyukin and two-time world champion Dmitri Bilozerchev in a display of perfection.

Bilozerchev, 21, drew six 10s in three days of competition but ended up with the bronze because of one mistake on the high bar. Lyukin, 21, took the silver.

The Soviets added six perfect scores in the all-around finals to the seven 10s they posted in Tuesday's team optionals.

Charles Lakes, the U.S. national champion from Chatsworth, Calif., was the top American finisher in 19th place. His best score was in his speciality, the high bar, where he scored a 9.950 with a series of flying releases over the bar and a double somersault dismount.

The other Americans in the all-around finals, Kevin Davis and Lance Ringnald, finished 34th and 35th in the 36-man field.

Weightlifter Mitko Grablev lost his gold in the 123-pound class and was banned from the Games after testing positive for a diuretic he used to shed a few pounds. Bulgarian officials said they deplored his drug use and would send him home on the next available flight.

Australian Alexander Watson, competing in the modern pentathlon, also was booted for having an excessive level of caffeine.