Australian Open results

Following are the results from day eight of the Australian Open on Monday (prefix number denotes seeding):

Men's singles fourth round

4-Stan Wawrinka Switzerland, bt Guillermo Garcia-Lopez, Spain, 6-4, 4-6, 7-6 (10-8)

5-Kei Nishikori, Japan, bt 9-David Ferrer, Spain, 6-3, 6-3, 6-3

Women's singles fourth round

11-Dominika Cibulkova, Slovakia, bt Victoria Azarenka, Belarus, 6-2, 3-6, 6-3

1-Serena Williams, United States, bt 24-Garbine Muguruza, Spain, 2-6, 6-3, 6-2

Madison Keys, United States, bt Madison Brengle, United States, 6-2, 6-4Endi