BRIEFLY : CHEATED OLYMPIANS WILL NOT GET MEDALS.

Byline: - Daily News Wire Services

American and British Olympic swimmers who sought medals of East Germans found to have taken performance-enhancing drugs were rejected Saturday by the International Olympic Committee.

Arguing that withdrawing or reassigning the medals would ``create a lot of new juridical problems,'' the IOC Juridical Committee in Lausanne, Switzerland, turned down the bid.

BOXING: In Frankfurt, Germany's Dariusz Michalczewski retained his WBO light-heavyweight title with a ninth-round combination that sent American Drake Thadzi staggering. Referee Louis Moret immediately ended the bout at 1:22 of the round.

On the undercard, unbeaten Cuban fighter Juan Carlos Gomez retained his WBC cruiserweight title by knocking out American Rodney Gordon in the second round.

FIGURE SKATING: Michelle Kwan easily won the World Professional Figure Skating Championship in Washington, D.C., the most prestigious of 10 sanctioned open competitions this year. At 18, she is the youngest world pro champion ever. Japan's Yuka Sato, winner of this event in 1996, finished second.

HOCKEY: The Philadelphia Flyers acquired Mikael Renberg from the Tampa Bay Lightning. Renberg, traded to the Lightning in 1997, rejoins Eric Lindros and John LeClair in Philadelphia. The Flyers also get center Daymond Langkow and sent forwards Chris Gratton and Mike Sillinger to the Lightning.