No. 4 David Ferrer beat No. 16 Kei Nishikori 6-2, 6-1, 6-4 in the fourth round Sunday.
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No. 2 Maria Sharapova beat Kirsten Flipkens 6-1, 6-0 and will play Makarova next.
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No. 4 Agnieszka Radwanska will play Li after dumping No. 13 Ana Ivanovic 6-2, 6-4.
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No. 10 Nicolas Almagro advanced to the quarterfinals when No. 8 Janko Tipsarevic retired at 6-2, 5-1. He'll face Ferrer.
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No. 5 Tomas Berdych beat Kevin Anderson 6-3, 6-2, 7-6 (13) to make his third straight Australian Open quarterfinal.
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No. 6 Li Na beat No. 18 Julia Goerges 7-6 (6), 6-1 to make her first Grand Slam quarterfinal since winning the 2011 French Open.
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No. 13 Milos Raonic takes a photo of the view at Eureka Skytower in Melbourne.
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Nishikori, a quarterfinalist last year, had a boisterous contingent of fans at Melbourne Park.
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Novak Djokovic needed five hours and two minutes to outlast No. 15 Stanislas Wawrinka, winning 1-6, 7-5, 6-4, 6-7, 12-10 to claim the longest match of this year's Australian Open and advance to the quarterfinals.
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The top-ranked Bryan brothers moved a step closer to their sixth Australian Open title, beating Jeremy Chardy and Lukasz Kubot 6-7, 6-4, 6-3.
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1987 Wimbledon champion Pat Cash takes part in a legends doubles match.
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