China's top player, Li Na reached the quarter-finals, beating Serbian ninth seed Jelena Jankovic 6-3, 6-love a big impressive win. The 2011 French Open champion will next face Russian 24th seed, Ekaterina Makarova who caused an upset by beating the Polish third seed, Agnieszka Radwanska 6-4, 6-4.

Fifth-seeded Li Na from China reached the U.S. Open quarter-finals on Sunday after beating Serbian ninth seed Jelena Jankovic 6-3, 6-0.

And the defending champion Serena Williams avenged her loss to Sloane Stephens at the Australian Open earlier this year by thrashing her fellow American. The World Number One showed no mercy against Stephens, crushing the rising star with an emphatic 6-4, 6-1 victory to keep her title defence on course.

While the 8th seed Angelique Kerber was not so lucky in her round four match against Carla Suarez Navarro. After losing the opening set, Suarez Navarro clawed her way back to win after failing to serve out the match at her first chance. The Spaniard will take on Serena Williams in the quarter-finals.

Men's defending champion and third seed Andy Murray progressed into the fourth round after beating Germany's Florian Mayer in straight sets. The Scotsman fired 42 winners on his way to the victory in ana impressive performance which took only an hour and 59 minutes. Next up for Murray is Denis Istomin, after the Uzbek beat 20th seed Andreas Seppi of Italy.

Fast becoming the story of the tournament.Lleyton Hewitt reached the last 16 for the first time since 2006. The 32-year-old recovered from a lapse in the second set to defeat Russia's Evgeny Donskoy in four . Hewitt will face another Russian, Mikhail Youzhny, for a berth in the first quarter-finals.

And Tomas Berdych of the Czech Republic is set to play Switzerland's Stanislas Wawrinka in the fourth round, after beating French opponent Julien Benneteau.

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