Top seed Ashleigh Barty of Australia overcame 49 unforced errors to prevail against Estonia’s Anett Kontaveit 4-6 7-5 7-5 and will next face Maria Sakkari, as the Greek reached the last eight with a tough 6-7(4) 6-4 6-4 win over ninth seed Aryna Sabalenka of Belarus.
Japanese second seed Naomi Osaka fired 15 aces to no double faults, but still it was a tough, two-and-a-half-hour victory over Hsieh Su-Wei of Chinese Taipei 7-6(3) 5-7 6-2. In the quarterfinals, Osaka will play American Sofia Kenin, who took down seventh seed Elina Svitolina of Ukraine 6-3 7-6(3).