China Open tennis results

Following are the China Open tennis results on Friday (prefix number denotes seeding, wc denotes wildcard): Men's singles quarterfinals 1-Novak Djokovic, Serbia, bt Jurgen Melzer, Austria, 6-1, 6-2 Feliciano Lopez, Spain, bt Sam Querrey, United States, 4-6, 6-4, 6-4 3-Jo-Wilfried Tsonga, France, bt Mikhail Youzhny, Russia, 6-3, 6-2 Florian Mayer, Germany, bt wc-Zhang Ze, China, 6-3, 6-4 Women's singles quarterfinals 9-Marion Bartoli, France, bt Carla Suarez Navarro, Spain, 6-0, 2- 6, 6-4 7-Li Na, China, bt 3-Agnieszka Radwanska, Poland, 6-4, 6-2 2-Maria Sharapova, Russia, bt 5-Angelique Kerber, Germany, 6-0, 3 -0 ,retired 1-Victoria Azarenka, Belarus, bt Romina Oprandi, Switzerland, 6-2, 6-0