Johanna Konta is to become the new British number one following Heather Watson's defeat in the first round of the Wuhan Open in China.
Current British number one Watson, 23, saved four match points but was unable to avoid a 6-3 2-6 6-3 loss to former world number one Jelena Jankovic.
Konta's win over German Andrea Petkovic in her first-round match means the 24-year-old will go above Watson when the new rankings are announced next week.
Konta next plays Victoria Azarenka.
Australia-born Konta, who is ranked 63 in the world, has won 19 of her last 20 matches since losing to Russian Maria Sharapova at Wimbledon.