Babos got past Michaela Honcova 6-2, 7-5 behind six breaks. She won more than 60 percent of the points on serve despite losing all three of Honcova's break opportunities. She had three breaks of her own, however, in each set.
With Babos leading the sweep by seeded players, unseeded Zheng Saisai and Eri Hozumi both moved into the quarterfinals with wins over qualifiers. Zheng beat Chinese countrywoman Liu Fangzhou 7-5, 6-2 by going 8-of-9 in break chances and Hozumi defeated Hu Yue-Yue, another Chinese player, 6-4, 2-6, 6-1 in winning two-thirds of the points in the final set.
Zheng faces another countrywoman in the quarters in fourth-seeded Zhang Shuai, who was a 6-1, 6-3 winner over Noppawan Lertcheewakarn after converting all six of her break opportunities. Hozumi next goes against second-seeded Misaki Doi, who defeated Xu Yi-Fan 7-6 (7-4), 6-3 even with seven double faults.
Seventh-seeded Tamarine Tanasugarn rallied for a 6-7 (6-8), 6-0, 6-3 win over Lee So-ra and earned a quarterfinals spot opposite Babos. No. 6-seeded Zhou Yi-Miao, a third Chinese player to advance out of the second round, beat Michaella Krajicek 6-4, 6-3. Zhou next plays third-seeded Shahar Peer, who took out Zarina Diyas 7-6 (8-6), 6-3 in her Wednesday match.