Madison Keys reaches quarterfinals
The second-seeded Keys was broken twice in the second set but still managed to win. The 19-year-old American will next face Luksika Kumkhum of Thailand. Kumkhum beat Eri Hozumi 2-6, 6-4, 6-4.
Heather Watson of Britain, the champion two years ago, lost to Yulia Putintseva of Kazakhstan 6-4, 7-5, while third-seeded Elina Sviotlina of Ukraine defeated Japanese wild-card entry Naomi Osaka 3-6, 6-3, 6-4.