Roddick, Ivanovic say goodbye

Ivanovic, who took over the No. 1 ranking after winning the French Open earlier this month, slumped to a 6-1, 6-4 loss to the wild-card entry and doubles specialist.

Ivanovic, who saved two match points before overcoming Nathalie Dechy in three sets on Wednesday, had no answer for the hard-hitting Zheng.

8220;It8217;s a surprise for me,8221; said the 24-year-old Zheng, who won the Wimbledon doubles title in 2006. 8220;Thanks to Wimbledon which gave me a wild card. I just tried my best and had to keep going, going.8221;

Ivanovic went out a day after 2004 champion and third-seeded Maria Sharapova was ousted by 154th-ranked Alla Kudryavtseva and two-time men8217;s runner-up Andy Roddick was bounced by Janko Tipsarevic. Ivanovic committed 17 unforced errors, converted only one of seven break points and lost serve four times. She could now lose the No. 1 ranking depending on how far No. 2 Jelena Jankovic and No. 4 Svetlana Kuznetsova advance in the tournament.

Other title favorites fared better on Friday.

Roger Federer continued his march toward a sixth straight Wimbledon title by beating Marc Gicquel in straight sets, setting up a fourth-round match-up with the last man to win the championship before him.

Two-time women8217;s champion Serena Williams dispatched 2006 winner Amelie Mauresmo 7-6 5, 6-1, extending her supremacy over the Frenchwoman to a career record of 10-2. After the first rain delay of the tournament, Federer overwhelmed the 53rd-ranked Frenchman 6-3, 6-3, 6-1 on Centre Court for his 62nd consecutive win on grass.

His next opponent will be Lleyton Hewitt, who won Wimbledon in 2002 8212; the year before Federer began his run.