Serena and Venus Williams remained on track to meet in the semifinals but Jelena Jankovic was ousted in the third round of the Dubai Championships on Wednesday. Top-seeded Serena beat Zheng Jie of China 6-4, 6-2, while sixth-seeded Venus put away Alize Cornet of France 6-3, 6-2. Third-seeded Jankovic, the runner-up in 2005 and a semifinalist the last two years, lost her first match with Kaia Kanepi of Estonia 6-2, 7-5. It was Kanepi first win over a top-five player. In the quarterfinals, Serena Williams will meet French Open champion Ana Ivanovic, while Venus will play defending champion Elena Dementieva. Win those matches, and the sisters will play each other for the first time since the WTA Championships in November, when Venus won en route to the title. Neither sister has won the Dubai title. Eighth-seeded Ivanovic beat lucky loser Camille Pin of France 6-2, 7-6 (5), while fourth-seeded Dementieva dispatched Anabel Medina Garrigues of Spain 6-1, 6-3. In the other quarterfinals, fifth-seeded Vera Zvonareva will play Virginie Razzano of France, and Kanepi will meet qualifier Elena Vesnina of Russia, guaranteeing one unseeded player into the semifinals. Zvonareva advanced when Marion Bartoli quit while trailing 5-2 because of painful blisters in her feet. Dominika Cibulkova of Slovakia also retired after feeling sick from the heat, with Vesnina up 4-6, 6-1, 4-0. Serra upsets Soderling Florent Serra of France withstood 20 aces to upset two-time finalist Robin Soderling 6-4, 6-7 (1), 6-2 in the first round of the Regions Morgan Keegan Championships in Memphis Tuesday. Second-seeded Juan Martin del Potro beat fellow Argentine Guillermo Canas 6-3, 7-6 (5) with only one service break, and he next faces Ernests Gulbis of Latvia, who upended 2003 champion Taylor Dent of the United States 6-4, 3-6, 6-2. Wild card Marcos Baghdatis of Cyprus defeated Kei Nishikori of Japan 7-5, 6-3. In the women's Cellular South Cup, top-seeded Caroline Wozniacki of Denmark breezed to a 6-1 6-2 first-round win over Jelena Dokic of Australia. Wozniacki meets Severine Bremond of France next. Meanwhile, second-seeded Victoria Azarenka of Belarus, fifth-seeded Marina Erakovic of New Zealand and Dutch qualifier Michaella Krajicek reached the quarterfinals. Azarenka put down Stephanie Cohen-Aloro of France 6-2, 6-2, Erakovic rallied past 17-year-old Melanie Oudin of the United States 4-6, 6-2, 6-3 and Krajicek outlasted Kristina Barrois of Germany 6-3, 3-6, 7-6 (7-0). Monfils out France's third seed Gael Monfils was knocked out of the ATP tournament in Marseille on Wednesday 6-4, 4-6, 7-5 by compatriot Paul-Henri Mathieu as Jo-Wilfried Tsonga and Novak Djokovic moved into the last 16. The 34th world-ranked Mathieu will now meet another Frenchman Michael Llodra who beat South African Rik De Voest 7-6 (7-2), 6-1. The winner of that match will play Russia's Mikhail Youzhny, who beat Italian Andreas Seppi 7-6 (7-2), 6-3 early on Wednesday. Top seed Djokovic of Serbia, playing his first tournament after retiring injured in the Australian Open quarterfinals, beat home player Jeremy Chardy 7-6 (7-2), 6-4 and fourth-seeded Frenchman Tsonga – beaten by Djokovic in the 2008 Australian Open final – had an uneventful victory over Kazakh Andrey Golubev 7-6 (7-5), 6-2. Pennetta upset Top-seeded Flavia Pennetta was ousted by unheralded Slovenian Masa Zec Peskiric 6-3, 4-6, 7-6 (4) in the first round of the Copa Colsanitas in Bogota Tuesday. Dominguez Lino, who fought two finals here with Pennetta, lost to Ioana Raluca Olaru of Romania 5-7, 6-4, 7-6 (3). Moya, Gaudio bow out Former French Open champions Carlos Moya and Gaston Gaudio couldn't survive the first round on Tuesday of the Copa Telmex in Buenos Aires. Moya, the Buenos Aires champ in lost to Argentine qualifier Maximo Gonzalez 6-4, 6-4 while Gaudio bowed to Daniel Gimeno-Traver of Spain 6-2, 4-6, 6