Wozniacki reaches quarterfinals in Beijing and becomes world number 1

By defeating Petra Kvitova today in the China Open, top seed Caroline Wozniacki became number 1 in the world. Wozniacki's opponent in the quarterfinals will be Ana Ivanovic, who defeated 7th seed Elena Dementieva 7-6, 7-6.

Also in the third round, Li Na defeated Angelique Kerber 6-2, 6-0.

In doubles, top seeds Gisela Dulko and Flavia Pennetta defeated 5th seeds Nuria Llagostera Vives and Maria Jose Martinez Sanchez 6-7, 6-1, 10-4. Chuang Chia-Jung and Olga Govortsova upset the 2nd seeds, Kveta Peschke and Katarina Srebotnik, 7-6, 6-2.