Monica Seles and Jennifer Capriati registered straight-set victories Wednesday, while Katerina Maleeva struggled in three sets, each advancing to the quarterfinals of the Nichirei International Ladies Tennis Championships.

Second-seeded Seles, the 16-year-old French Open champion from Yugoslavia, needed only 36 minutes to dispatch West Germany's Eva Pfaff 6-1, 6-0 in a second-round match on the indoor courts of the Tokyo Metropolitan Gymnasium.Capriati, the 14-year-old teenage sensation from Wesley Chapel, Fla., who is making her first appearance in Japan, defeated Magdalena Maleeva 6-2, 6-4. Katerina Maleeva of Bulgaria rallied to beat American Gigi Fernandez 6-7 (6-8), 6-2, 6-2.

Also advancing to the quarterfinals was No. 8 seed Amy Frazier of Rochester Hills, Mich., who beat Eva Sviglerova of Czechoslovakia 6-2, 7-5.

Top-seeded Martina Navratilova and No. 4 Mary Joe Fernandez begin second-round play Thursday. Navratilova meets Stephanie Rehe and Fernandez faces Cristina Tessi.

"She wasn't the toughest opponent I could have drawn in the second round," said Seles, who makes her home in Sarasota, Fla. "Nothing was going extremely well; everything was just going fair."

Katerina Maleeva, ranked No. 7 in the world, needed 2 hours and 18 minutes to put away the ninth-seeded Gigi Fernandez of Aspen, Colo.

Capriati, who struggled in a first-round match against Japan's Misumi Miyauchi, ranked 266th in the world, lost only three points on her serve in the first set and was never threatened by 15-year-old Magdalena Maleeva.