Maria Sharapova makes her point with a 6-1 6-0 win over Casey Dellacqua in 51 minutes
Tim Henman, playing his last Grand Slam, tries to dig out one final effort to beat Jo-Wilfried Tsonga
But despite being two sets to one down, Djokovic comes through after nearly five hours on court
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Korean Hyung-Taik Lee celebrates a four-set win over Britain's Andy Murray, the 19th seed
Murray's familiar temper got the better of him as he lost to Hyung-Taik Lee
Second seed Maria Sharapova struggles with her serve as she drops the opening set against Agnieszka Radwanska
The defending champion levels the match and goes a break up in third set but pays the price for too many unforced errors
Teenager Radwanska can hardly believe it as she beats Sharapova to cause the shock of the tournament so far
And it proves to be a good day for teenagers as 18-year-old Belarussian Victoria Azarenka beats Martina Hingis
Ten years after she won her only title in New York, Hingis is sent packing in the third round
Austria's Tamira Paszek. who is only 16, sends 11th seed Patty Schnyder tumbling out in three sets
But 18-year-old Nicola Vaidisova finds herself on the end of an upset late on Saturday
Vaidisova, the 13th seed, loses a thrilling night match 6-4 3-6 7-6 to Israel's Shahar Peer
Fourth seed Nikolay Davydenko breezes into the fourth round with a straight-sets victory over Nicolas Almagro
Former champion Andy Roddick was in fine form, dropping just five games against Thomas Johansson
Anna Chakevetadze looks to the heavens as she seals victory over India's Sania Mirza 6-2 6-3
Top seed Roger Federer struggles to get his racquet on the ball against big-serving American John Isner
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Sunday's most anticipated match sees 19-year-old Serb Ana Ivanovic take on twice former champion Venus Williams
But Williams is not in the mood for hanging around and condemns Ivanovic to a comprehensive 6-4 6-2 defeat
Serena Williams opens up the day's play against Marion Bartoli in the fourth round at the US Open
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Feliciano Lopez makes a fantastic start in the final match of the day against world number one Roger Federer
Federer is in trouble at a set down and on serve deep into the second set against Lopez
But the world number one turns the match around with some breathtaking play to win four sets
Sixth seed Anna Chakvetadze takes the spotlight in the first of Monday's night matches, beating Tamira Paszek 6-1 7-5
Earlier in the day, fourth seed Svetlana Kuznetsova races through the first set of her match with Victoria Azarenka
Teenager Azarenka beat Martina Hingis in the last round but has no answer against Kuznetsova
Fifth seed Andy Roddick saves a set point to win the first set against Tomas Berdych
Berdych goes 2-0 down in the second set and then retires with sickness, sending Roddick through to the last eight
Britain's Daniel Cox loses in straight sets to 11th seed Thomas Fabbiano in the boys' singles
But there is better news for another British junior, Dan Evans, who wins his first-round boys' match
Teenager Agnes Szavay, playing her first US Open, faces Julia Vakulenko in the fourth round
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Serena Williams fails to convert a set point before dropping the tie-break in her match against Justine Henin
Henin is in top form as she completes a 7-6 (7-3) 6-1 win that takes her into the last four
It is the third consecutive Grand Slam in which Henin beats Williams in the quarter-finals
Ernests Gulbis is one of several surprise players in the last 16 and he faces veteran Carlos Moya on Arthur Ashe Stadium
Moya has been enjoying a good run of form lately and carries that into this match, taking a two-set lead
Moya celebrates his four-set victory as he reaches the last eight of the US Open for the first time since 1998
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Mission accomplished as Anna Chakvetadze beats Shahar Peer 6-4 6-1 to reach her first Grand Slam semi-final
Peer is the first Israeli woman to appear in the US Open quarter-finals but the 20-year-old's run comes to an end
Hungarian Agnes Szavay is through to the US Open quarter-finals on her first visit to New York
But former champion Svetlana Kuznetsova proves far too strong for the 18-year-old, beating the youngster 6-1 6-4
Tommy Haas makes his feelings known to the umpire as he struggles to keep pace with in-form Nikolay Davydenko
Davydenko is still the only man not to drop a set at the tournament after a 6-3 6-3 6-4 victory
The Arthur Ashe Stadium crowd await an enticing evening session, featuring Venus v Jankovic and Roddick v Federer
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Spain's David Ferrer is looking to reach a Grand Slam semi-final for the first time in Thursday's opening match
Argentina's Juan Ignacio Chela does not prove much of a challenge for 15th seed Ferrer
Ferrer triumphs 6-2 6-3 7-5 in just over two hours and now faces Novak Djokovic or Carlos Moya
Belarus's Max Mirnyi and Victoria Azarenka win the mixed doubles, beating Leander Paes and Meghann Shaughnessy
Third seed Novak Djokovic starts a strong favourite in his quarter-final against Spanish veteran Carlos Moya
Moya, who last reached the US Open semis in 1998, drops serve at the end of the first set to fall behind
American actor Alec Baldwin is in the Arthur Ashe Stadium crowd, hoping for a late-night thriller