Zhang on the other hand played a neater but overly conservative match, committing 37 unforced but only managing 13 winners.

Osaka will face Anastasija Sevastova in the semifinals, who had a much easier time with world No. 30 Dominika Cibulkova, moving past her in straight sets: 6-3, 7-6 (5).

Later in the day, women's No. 2 seed Caroline Wozniacki secured safe passage to the semifinals, besting Katerina Siniakova of the Czech Republic 6-2, 6-2.

Wozniacki raced to a 3-0 lead out the gate. From then on, the Dane had enough to keep her opponent at arm's length for the rest of the set, only giving away two points to Siniakova across the entirety of her four service games.

The Dane continued her good form into the second set, seemingly toying with a tired-looking Siniakova with a selection of lobs and aggressive baseline shots, breaking the Czech's serve again to go 3-0 up.

The remainder of the set played out in familiar fashion, with Wozniacki typically strong on serve and never really looking threatened, as she sealed a straightforward win in one hour nine minutes.

Wozniacki was a model of consistency throughout, only making seven unforced errors to Siniakova's 28. The Dane now plays China's Wang Qiang in the semifinals, who in the late match on court stunned world No. 16 and Wuhan Open champion Arnya Sabalenka, snapping her 8-match winning streak in straight sets: 7-5, 7-5.

Wang's fluidity of play worked wonders just as Sabalenka's tendency to accumulate unforced errors worked against her in the first set.

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