Switzerland's Martina Hingis and Kim Clijsters of Belgium advanced to the semifinals of the Adidas International tennis tournament in Sydney on Thursday.

Hingis, the second seed, beat seventh-seed Sandrine Testud of France, 6-4, 6-2. Clijsters, the third seed, outlasted compatriot Justine Henin, 7-6 (5), 6-2, the fifth seed.

Friday's semifinal will feature Hingis seeking her 500th professional singles victory. Clijsters will earn her 200th win if she can defeat Hingis.

Eighth seed Meghann Shaughnessy moved into the semifinals by topping fellow American Alexandra Stevenson, 6-4, 6-1. Stevenson defeated Jennifer Capriati on Wednesday. Shaughnessy will face Serena Williams, who advanced on Wednesday with a victory over France's Amelie Mauresmo.

In the men's draw, France's Nicolas Escude withdrew before his quarter-final because of a groin injury, handing Argentina's Juan Ignacio Chela a place in the semifinals.

Escude's withdrawal caused a reshuffle in the program, with American Andy Roddick rescheduled to play his quarter-final against South Korea's Lee Hyung-taik on centre court later Thursday.

The winner of that match meets No. 2 seed Roger Federer of Switzerland, who beat former world No. 1 Marcelo Rios 6-7 (2), 7-6 (4), 6-3.

Max Mirnyi of Belarus beat Julien Boutter of France 6-4, 6-2 in the first men's quafter-final.