Argentina's Gisela Dulko begins the day's play at the Arthur Ashe Stadium against fourth-round opponent Kateryna Bondarenko of Ukraine
However, what is expected to be a tight match is anything but, as Bondarenko (right) double bagels Dulko in 47 minutes - bad showing from the Argentine
In the men's fourth round, eighth seed Nikolay Davydenko battles back to win the second set of his encounter against Sweden's Robin Soderling 6-3 after losing the first 7-5
But Russian Davydenko's challenge ends after a leg injury forces him to retire with the scores 7-5 3-6 6-2 in favour of Soderling
After wins against Maria Sharapova and Elena Dementieva, American teenager Melanie Oudin was looking to wow the home support again with victory over Nadia Petrova
The 17-year-old loses the first set 6-1 but in true 'Oudini' style bounces back to beat 13th seed Petrova and win a place in her first ever Grand Slam quarter-final - the picture says it all
There is also joy for Belgium's Yanina Wickmayer who books a clash against Bondarenko following a 4-6 6-4 7-5 win over Petra Kvitova
People begin to filter into the Arthur Ashe Stadium for the big match between reigning champion Roger Federer and Tommy Robredo
Two famous names watching the action are film actress Nicole Kidman with her husband and singer Keith Urban - both keen tennis fans
Also in the crowd is British six-time golf major winner Nick Faldo - wonder if his backhand swing is as good as his golf swing
They are all there to watch world number one Federer continue his mission to land a record-equalling sixth successive US Open title - although opponent Tommy Robredo stands in his way
But it all proves far too easy for Federer who takes one hour and 48 minutes to book a quarter-final match against Soderling, who he beat in the French Open final
Big-serving home hope John Isner, who knocked out compatriot Andy Roddick in round three, starts his fourth-round match with 10th seed Fernando Verdasco strongly and takes the first set 6-4
But Isner cannot sustain his form and Verdasco, who has never been past the last 16 at Flushing Meadows, hits back to take the next three sets and seal a place in the quarter-finals
Legendary crooner Tony Bennett (right) is in the Arthur Ashe Stadium to witness the night session on day eight
Russia's Svetlana Kuznetsova hopes to repeat her US Open triumph of 2004 and takes the opening set against Denmark's Caroline Wozniacki in the first of the night matches
Wozniacki, trying to reach her first Grand Slam quarter-final, battles back to level after winning the second set tie-break
Wozniacki holds her nerve in a tense final set, taking the tie-break for a 2-6 7-6 (7-5) 7-6 (7-3) victory
Novak Djokovic makes a flying start to the final match of day eight, racing through the first set 6-1 against Radek Stepanek
Djokovic is in fine form and sails through to a 6-1 6-3 6-3 victory and a quarter-final against 10th seed Fernando Verdasco
After his swift victory Djokovic has time to take on John McEnroe, who heads down from his commentary box
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