By Caroline Cheese
BBC Sport at Wimbledon
China's Na Li caused a surprise by knocking out fifth seed Svetlana Kuznetsova in the third round.
Li goes on to face Karolina Sprem or Nicole Vaidisova
The 24-year-old, making her Wimbledon debut, triumphed 3-6 6-2 6-3 to book a place in the fourth round of Grand Slam for the first time in her career.
Li looked to have lost her grip on the match when Kuznetsova broke back in a tense deciding set.
But the 27th seed composed herself and broke again at 4-3 before calmly serving out her biggest career win.
Li is the first Chinese player to ever reach the fourth round of the Championships and she said: "When I was in the locker room afterwards I still couldn't quite believe it."
Li took a break from the game in 2003 to return to college and since her comeback has become world number 30.
"Definitely that helped, before I was just a little girl and when something happened on court I couldn't really think properly," she said. "I think now I've grown up a lot."
Li is one of six Chinese players in this year's women's singles but there are no men in the main draw.
She added: "The Chinese tennis federation is concentrating more on girls' tennis to start with because it's easier.
"Men's tennis is very strong but there are not so many good women players in the world."
Belgian number two seed Kim Clijsters moved into the last 16 with a straight-sets win against China's Jie Zheng.
Henin-Hardenne joined compatriot Clijsters in the next round
Clijsters, 23, took one hour and 11 minutes to beat Zheng 6-3 6-2.
After racing to a 4-2 lead, the 2003 semi-finalist survived a mini-fightback from Zheng at 5-3 to seal the set.
But she eased through the second, breaking her opponent three times to set up a clash with Poland's Agnieszka Radwanska or Thai Tamarine Tanasugarn.
Fellow Belgian Justine Henin-Hardenne marched into the fourth round with a comprehensive 6-2 6-3 win over Anna Chakvetadze.
Henin was hardly troubled by her opponent, playing at Wimbledon for the second time, and seemed certain to win as soon as she earned an early break.
Chakvetadze did break the third seed once in the second set but she was inconsistent and was broken five times.
Play was halted briefly in the first set when a ballgirl was taken ill in the heat and was helped off court.
The victory keeps alive Henin-Hardenne's dream of completing a full set of Grand Slam titles.
"When I was a little girl, I was dreaming of winning the Grand Slam one day," said the third seed, who has to yet to drop a set at this year's tournament.
"I've won everything except Wimbledon so it's a big challenge for me."
Meanwhile, 15th seed Daniela Hantuchova of Slovakia beat Slovenian Katarina Srebotnik 6-4 7-6 (7-2).
And 31st seed Gisela Dulko suffered a surprise exit - losing 7-6 (8-6) 5-7 7-5 to France's Severine Bremond, already enjoying her best-ever Wimbledon, in a match featuring 10 breaks of serve.
Czech Nicole Vaidisova, seeded 10th, concluded the action on Friday, beating Croatian Karolina Sprem 7-5 7-5.