World number one Caroline Wozniacki came back from a set and 4-1 down to defeat Svetlana Kuznetsova and reach the US Open last eight on Monday just as her lofty status again looked too heavy a burden to bear.Caroline Wozniacki celebrates winning against Svetlana Kuznetsova on
The Dane, who is still searching for an elusive Grand Slam title to support her top ranking, saw off the tiring 2004 champion Kuznetsova 6-7 (6/8), 7-5, 6-1 and will now tackle Germany's Andrea Petkovic for a place in the semis. In the other quarter-final in the top half of the draw, three-time winner Serena Williams will clash with Russia's Anastasia Pavlyuchenkova.
It was a huge struggle for the 21-year-old Wozniacki on a night of fluctuating fortunes on Arthur Ashe Stadium in a gruelling 3hr 2min.
She surrendered a 5-2 lead in the first set tie-break and then slipped 1-4 down in the second set before 15th-seeded Kuznetsova's game fell to pieces. "I knew I could come back so I just stepped into the lines and went for my shots. I am in good shape. I can play for five hours if I have to. I wanted to keep the rallies going."