SAN FRANCISCO: Results from the fifth day of the WTA hardcourt tournament in Stanford, California, on Friday (x denotes seeding):

Quarter-finals

Venus Williams (USA) bt CiCi Bellis (USA) 6-4, 6-1

Alison Riske (USA) bt Coco Vandeweghe USA x4) 6-3, 0-1 retired

Johanna Konta (GBR x3) bt Zheng Saisai (CHN) 6-2, 4-6, 6-3

Dominika Cibulkova (SVK x2) bt Misaki Doi (JPN x5) 7-5, 6-0

Copyright AFP (Agence France-Presse), 2016