Yan Zi of China upset world number four Jelena Jankovic of Serbia in three sets on Friday to storm into the semi-finals of the 600,000-dollar WTA Bangalore Open here. Yan, ranked 54th in the world, won 6-3, 3-6 and 6-3 as the top-seeded Jankovic struggled with a shoulder injury during the third set of the quarter-final match.
Yan, looking for her second career title, will take on fourth-seed Patty Schnyder of Switzerland in Saturday's semi-final. Schnyder, ranked 12th in the world, fought off a spirited challenge from unseeded Akgul Amanmuradiva of Uzbekistan before winning 4-6, 6-4, 7-6 (7/1) in two hours and 25 minutes.
The other semi-final will feature the Williams sisters, Venus and Serena, who cruised to the last four with easy wins. Second seed Venus brushed aside Vera Zvonareva of Russia 6-4, 6-3 before younger sister Serena, seeded third, crushed another Russian Anastasia Rodionova 6-1, 6-4.