Britain's Johanna Konta reached the last 16 at the Wuhan Open in China after Victoria Azarenka retired with a leg injury in round two.
The 24-year-old Briton led 6-4 1-0 when former world number one Azarenka decided she could not continue.
Konta, the world number 63, will replace Heather Watson as British number one in next week's rankings.
She came through two rounds of qualifying in Wuhan, joining 19 of the world's top 20 in the main draw.
More to follow.
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