Zhang Shuai ousts third seed Madison Keys to reach San Jose quarterfinals

China's Zhang Shuai has reached her first quarterfinal at San Jose Open on Wednesday (4 August).

32-year-old journeywoman ousted former champion Mison Keys 7-5, 7-6 (5) in one hour and 41 minutes.

match was decided on finest of margins when Zhang challenged an in call during tiebreak.

line check showed that ball was out, handing victory to Zhang.

She will meet Croatian qualififer Ana Konjuh in final eight.