Elsewhere in the women's draw, 4th seed Naomi Osaka of Japan made easy work of Andrea Petkovic, breaking every one of her opponent's service games on the way to a bagel second set, 6-2, 6-0. Osaka next faces Wuhan Open runner-up Alison Riske who needed a decider to take out Ajla Tomljanovic, 6-3, 3-6, 6-4.

A major casualty today was Wuhan Open champion Arnya Sabalenka, who coughed up nine double faults off 53 percent first service shooting to fall in straight sets to Daria Kasatkina, 6-4, 7-6 (5). Kasatkina faces Ekaterina Alexandrova in the round of 16.

Another casualty was world No. 13 Angelique Kerber, whose bad post-Wimbledon run of form continued with a straight-sets loss to Polana Hercog, 6-4, 6-2. Hercog set up a round of 16 clash with 8th seed Kiki Bertens.

16th seeded Caroline Wozniacki had better luck against qualifier Christina McHale, who coughed up 46 unforced errors on the way to dropping a bagel second set, 6-4, 6-0. Wozniacki faces Katerina Siniakova in the round of 16.

World No. 7 Petra Kvitova logged a relatively straightforward win over Kristina Mladenovic, 6-4, 6-4, setting up a meeting with Belinda Bencic in the round of 16.

Round of 16 action gets underway tomorrow at China's National Tennis Center.

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