Top-ranked Martina Hingis beat Manuela Maleeva in straight sets and reached the semifinals of the Porsche Cup in Filderstadt, Germany, where she will have the opportunity to avenge a defeat by Amanda Coetzer.
Coetzer beat the 17-year-old Swiss prodigy in the semifinals last week in Leipzig, handing Hingis only her third defeat of the year.
"I am really motivated for this match, I'd be really upset to lose twice in a row to the same player," said Hingis, who won, 6-2, 6-3, against Maleeva.
Coetzer, the fifth-seeded South African, beat the other Swiss teen, Patty Schnyder, 6-2, 7-5, to earn another semifinal clash against Hingis. Eighth-seeded Irina Spirlea and Lisa Raymond also advanced.
Elsewhere, Swedes Magnus Gustafsson, Thomas Johansson and Mikael Tillstrom, along with Germany's Nicolas Kiefer, won quarterfinal matches in the Heineken Open in Singapore.
Jim Courier, the No. 3 seed, pulled a muscle in his left quadriceps tendon during the second set of his match against Johansson. Courier dropped his serve in the third game of the second set and did not recover, and the fifth-seeded Johansson won, 3-6, 6-3, 6-2.
In today's semifinals, Kiefer faces Tillstrom and Gustafsson plays Johansson.
In Vienna, Austria, third-seeded Goran Ivanisevic defeated Bohdan Ulihrach, 7-6 (7-2), 3-6, 6-3, to advance to his third CA Trophy tournament semifinal. The Croatian, who won the CA Trophy in 1993, will meet Richard Krajicek from the Netherlands. Krajicek defeated Sweden's Magnus Larsson, 6-4, 6-4.
Fourth-seeded Greg Rusedski of Britain and fellow Brit Tim Henman both won.