MELBOURNE, Jan. 22 (Xinhua) -- Following are the results from Day 9 of the Australian Open on Tuesday:

Men's singles

Quarter-finals

14-Stefanos Tsitsipas, Greece, bt 22-Roberto Bautista, Spain, 7-5, 4-6, 6-4, 7-6 (2)

2-Rafael Nadal, Spain, bt Frances Tiafoe, United States, 6-3, 6-4, 6-2

Women's singles

Quarter-finals

Danielle Collins, United States, bt Anastasia Pavlyuchenkova, Russia, 2-6, 7-5, 6-1

8-Petra Kvitova, Czech Republic, bt 15-Ashleigh Barty, Australia, 6-1, 6-4

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