Tomas Smid of Czechoslovakia upset fourth-seeded Guillermo Perez-Roldan of Argentina, 6-2, 7-6, Friday to reach the semifinals of a $231,000 tournament at Geneva.
Perez-Roldan, 17, the 1985 French Open junior champion, is ranked No. 20 in the world. Smid is ranked No. 37.
In today's semifinals, the unseeded Smid, who won at Geneva in 1985, will face top-seeded Andres Gomez of Ecuador, who defeated Thierry Tulasne of France, 7-6, 6-4.
Gomez had beaten Tulasne in each of their five previous meetings.
In the other semifinal, Claudio Mezzadri of Switzerland will meet sixth-seeded Ulf Stenlund of Sweden. Mezzadri ousted countryman Roland Stadler, 6-4, 6-1, while Stenlund rallied for a 4-6, 6-1, 7-5 victory over Horacio de la Pena of Argentina.
At Tokyo, top-seeded Gabriela Sabatini of Argentina overcame a slow start to beat Etsuko Inoue of Japan, 6-2, 6-3, in the quarterfinals of the $300,000 Pan Pacific Women's Open.