Defending champion Serena Williams saved four match points before losing 6-3 7-6 to Frenchwoman Marion Bartoli in the fourth round at Wimbledon.

Top seed Caroline Wozniacki followed the American out of the tournament, losing 1-6 7-6 7-5 to Slovakia's Dominika Cibulkova.
And Venus Williams also went out as the carnage of the big names continued, with the five-times champion going down 6-2 6-3 at the hands of Bulgaria's Tsvetana Pironkova.
Serena Williams, seeded seventh after serious health problems, struggled throughout against ninth-seeded Frenchwoman Bartoli, making a succession of unforced errors on Court One.
Bartoli took the first set on her sixth set point and she continued to move the 13-times Grand Slam champion ruthlessly around the court to move to the brink of victory.
She had three match-points in the 12th game of the second set but Williams showed all her battling qualities and great composure to save them and force a tiebreak.
Bartoli continued to serve strongly and she earned another two match points, the first of which Williams saved with an ace, but the Frenchwoman took the second to take the tie-break 8-6.
""Beating Serena is a dream come true, she is one of the greatest champions of the open era,"" Bartoli said after the match.
""It was not easy mentally but I did it and I am very happy. She is very imposing. If you look at her it is difficult to handle the pressure so I was just trying to focus on my own game.""
Top seed Wozniacki remains a world number one without a Grand Slam title after she was beaten 6-1 7-6 7-5 by Cibulkova in a gripping fourth-round match.
In four previous appearances at Wimbledon the Dane had failed to get beyond the fourth round but, playing with the confidence gained from five WTA titles this year, she looked set to end that run after a flying start.
Wozniacki reached the second week with the minimum of fuss, winning all her matches in straight sets and dropping only 12 games, the least by any player in the tournament, and duly strolled through the first set.
With Serena Williams having gone out earlier in the day it was looking like a great opportunity for Wozniacki to break her Grand Slam duck.
However, Cibulkova pulled herself together in the second and, playing far more aggressively, took the game to the top seed.
Unleashing the huge forehands that belie her diminutive stature, the Slovak 24th seed forced a tiebreak which she took 7-5 to ask the world number one a serious question for the first time in the tournament.
The third set was all over the place with two breaks apiece in the first six games as the two women backed themselves to overpower the other from the baseline.
It then went with serve to 5-5, when Cibulkova again broke.
She held three match points in her final game and though Wozniacki saved two of them, Cibulkova kept her nerve on the third to win the match by fittingly crashing yet another forehand winner down the line to set up a quarter-final match against Maria Sharapova.
Asked how she had turned things around after the first-set swamping, Cibulkova said: ""I just had to be more aggressive on return and more confident on my return.
""Even in the first set I was doing well in the few rallies there were so I had to get into the rallies.
""It was a great win because it's very hard to beat her. She's a very defensive player and you have to go for your shots. I was really risking it, my forehand was really working and I went for it.
""We've played each other many times and I've beaten her this year and I knew my game is suited to her.""
The shocks continued as five-times Wimbledon champion Venus Williams went down as well, losing at the hands of Bulgarian Pironkova for the second year running.
The American, seeded only 23rd after spending most of the year out injured, failed to fire in the fourth-round clash and was hammered 6-2 6-3 on Centre Court.
Pironkova, the 32nd seed, will now face Petra Kvitova with both players bidding for semi-final places again after their surprise runs last year.
Cibulkova will play fifth seed and former champion Maria Sharapova in the last eight after the Russian overpowered Peng Shuai 6-4 6-2 to reach the quarter-finals in double-quick time.
With fiance Sasha Vujacic roaring his approval on a sweltering Court Two, the Russian fifth seed had a few early problems against the unorthodox Chinese before striding away to the last eight on the lawns for the first time since 2006.
The 2004 champion had to save two break points as the opening two games took nearly 15 minutes and her forehand and serve were both a little hit-or-miss.
Peng, who hits double-handed off both sides, threatened again with Sharapova serving at 3-4 but the blonde ramped up the volume and the power on her bludgeoning forehand to stay on level terms then broke through in the next game.
Peng, playing in the fourth round of Wimbledon for the first time, panicked, going down 0-40 and although a couple of beefy serves clawed back two of the break points Sharapova pounced on the third when her opponent made a mess of a forehand she was forced to play one-handed.
Sharapova served out the set to love with an ace and there was sense of inevitability about the rest of the match as she eased through the second set. The Florida-based 24-year-old is yet to drop a set at the championships this year.
Victoria Azarenka, seeded fourth for the tournament, wasted little time in brushing aside Nadia Petrova 6-2 6-2 and will next face Tamira Paszek, who ground her way past Ksenia Pervak in three topsy-turvy sets, eventually closing out the contest 6-2 2-6 6-3.
Rising star and eight seed Petra Kvitova was also a straight sets winner, dropping just two games en route to a 6-0 6-2 victory over 19th seed Yanina Wickmayer.
And Sabine Lisicki, conqueror of French Open champion Li Na earlier in the tournament, continued her sparkling run with a 7-6 6-1 triumph over Petra Cetkovska. (Source: Reuters)