MELBOURNE, Jan. 20 (Xinhua) -- Following are the results of the Australian Open at Melbourne Park on Sunday (prefix number denotes seeding):

Men's singles

Fourth round

22-Roberto Bautista-Agut, Spain, bt 6-Marin Cilic, Croatia, 6-7 (6), 6-3, 6-2, 4-6, 6-4

14-Stefanos Tsitsipas, Greece, bt 3-Roger Federer, Switzerland, 6-7 (11), 7-6 (3), 7-5, 7-6 (5)

Frances Tiafoe, United States, bt 20-Grigor Dimitrov, Bulgaria, 7-5, 7-6 (6), 6-7 (1), 7-5

2-Rafael Nadal, Spain, bt Tomas Berdych, Czech Republic, 6-0, 6-1, 7-6 (4)

Women's singles

Fourth round

8-Petra Kvitova, Czech Republic, bt Amanda Anisimova, United States, 6-2, 6-1

15-Ashleigh Barty, Australia, bt 30-Maria Sharapova, Russia, 4-6, 6-1, 6-4

Anastasia Pavlyuchenkova, Russia, bt 5-Sloane Stephens, United States, 6-7 (3), 6-3, 6-3

Danielle Rose Collins, United States, bt 2-Angelique Kerber, Germany, 6-0, 6-2

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