Mark Woodforde of Australia upset second-seeded Andrei Chesnokov of the Soviet Union, 6-2, 2-6, 7-6 (7-2), Wednesday in the second round at the Copenhagen Open.
Woodforde, ranked 91st in the world, will meet Anders Jarryd of Sweden, a 6-3, 6-2 winner over Jan Gunnarson, also of Sweden, in the quarterfinals.
In other matches, top-seeded Jonas Svensson of Sweden struggled past Frederik Fetterlein of Denmark, 6-3, 2-6, 6-2, seventh-seeded Christian Bergstrom of Sweden rallied to beat Carl Uwe Steeb of Germany, 3-6, 6-3, 6-3, third-seeded Jakob Hlasek of Switzerland defeated Lars Jonsson of Sweden, 6-3, 6-4, fourth-seeded Karel Novacek of Czechoslovakia beat Jose Altur of Spain, 6-3, 6-2, sixth-seeded Todd Woodbridge of Australia downed Thomas Hogstedt of Sweden, 6-3, 6-0, and Christian Saceanu of Germany upset fifth-seeded Ronald Agenor of Haiti, 6-3, 7-6. .
In the quarterfinals, Svensson plays Bergstrom, Hlasek meets Saceanu and Woodbridge faces Novacek.
Third-seeded Mary Joe Fernandez downed Amanda Coetzer of South Africa, 6-4, 6-1, in her opening match of a Virginia Slims tournament at Boca Raton, Fla.
In other matches, Lisa Bonder- Kreiss upset sixth-seeded Barbara Paulus, 6-4, 6-3, eighth-seeded Nathalie Tauziat of France defeated Peanut Louie-Harper, 6-0, 6-3, and ninth-seeded Helen Kelesi of Canada beat Halle Cioffi, 6-3, 6-1.
Fourth-seeded Jennifer Capriati, who made her professional debut at Boca Raton a year ago, played Karin Kschwendt of Luxembourg in a night match.
Fernandez, 19, won two tournaments last year and reached the final of the Australian Open. Slowed by injuries in the past, she hopes to eliminate them with a training program started in July.