WIMBLEDON, England -- Top-ranked Ana Ivanovic has been upset by Zheng Jie of China in the third round at Wimbledon.
Ivanovic lost 6-1, 6-4 to Zheng, who was ranked No. 133 entering Centre Court on Friday. Ivanovic earned the No. 1 ranking after a win at the French Open.
The 20-year-old Serbian player had to save two match points in her second-round win over Nathalie Dechy. She had no answer for the powerful shots from Zheng, a former Wimbledon doubles champion.
Ivanovic went out a day after third-seeded Maria Sharapova was upset in the second round.
Two-time champion Serena Williams has defeated 2006 winner Amelie Mauresmo to advance to the fourth round at Wimbledon.
After letting an early break slip before winning the first set in a tiebreaker, Williams went on a five-game streak en route to a 7-6 (5), 6-1 win Friday in the third-round match.
Williams, who won the title in 2002 and 2003, broke Mauresmo six times and clinched the match with a forehand winner on her second match point.