Thomas Muster of Austria outlasted top-seeded Sergi Bruguera of Spain, 4-6, 6-4, 6-4, in the quarterfinals of the Geneva Open.
Muster will meet the Soviet Union's Andrei Medvedev in the semifinals.
Bruguera's defeat left No. 4 Horst Skoff of Austria as the highest-seeded player in the tournament. Skoff defeated Horacio de la Pena of Argentina, 7-6 (7-3), 4-6, 6-1.
Top-seeded Guy Forget led a French charge into the semifinals of the $300,000 tournament at Bordeaux, France, by defeating Sweden's Lars Jonsson 6-3, 6-3.
All four quarterfinals were won by French players.
Olivier Delaitre beat eighth-seeded Alexander Mronz of Germany, 4-6, 6-3, 6-0. Thierry Champion defeated countryman Arnaud Boetsch, 6-2, 7-6 (7-4), and Cedric Pioline beat countryman Fabrice Santoro, 6-3, 3-6, 6-4.
Javier Sanchez of Spain defeated Todd Martin, 6-2, 6-2, and Andres Gomez of Ecuador swept Argentina's Martin Jaite, 6-3, 6-3, in the quarterfinals of a $250,000 tournament at Brasilia, Brazil.
Dodo Cheney of Santa Monica won two titles in the women's 70 division of the USTA Grass Court Championships at the Cedarhurst, N.Y., Rockaway Hunting Club, raising her career total to 212.
Cheney, 75 and seeded No. 1, beat Nellie Kagan of Fort Lee, N.J., 6-2, 2-6, 7-5, in the singles final. Cheney then teamed with Corky Murdoch of Los Angeles to win the doubles crown.
Fifth-seeded King Lambert of Santa Ana won when Russell Seymour of Spicewood, Tex., retired in the men's 60 semifinals. Lambert will play top-seeded Chuck DeVoe of Indianapolis for the title.