Julia Goerges beat top seed Kristina Mladenovic 6-2, 7-6 (7/4) to reach the WTA Elite Trophy semi-finals and send the Frenchwoman tumbling out of the world top 10 on Friday.
Mladenovic needed a straight-sets win to reach the Zhuhai semis but she instead went down in one hour, 36 minutes, ceding her number 10 ranking to America’s CoCo Vandeweghe.
READ | Anastasija Sevastova joins CoCo Vandeweghe in WTA Elite Trophy tennis semifinals
It ends a career-high season for Mladenovic, who finished 2016 ranked 42nd but won her first tour title in St Petersburg and reached three other finals this year.
Anastasija Sevastova booked her semi-final spots without dropping a set in the round-robin phase of the WTA Elite Trophy in Zhuhai on Thursday.
Sevastova, making her tournament debut, posted a perfect record in Camellia Group with a 6-3 6-4 win over Barbora Strycova of Czech Republic.