World number one Simona Halep recovered from a set down to beat Duan Ying-Ying in the second round of the Shenzhen Open and secure top seeding for this month's Australian Open.
Halep's comeback saw the Romanian get past her Chinese opponent 3-6 6-1 6-2, setting up a last-eight meeting with Aryna Sabalenka of Belarus.
Halep, quoted on wtatennis.com, said after the win: "I'm not thinking about the ranking, I'm not thinking about the Australian Open.
"I will just keep the same routine and same things to do. I'm just thinking about the match (on Thursday)... I want to be focused just here."
Along with Halep, others progressing to the quarter-finals were compatriot Irina-Camelia Begu - scheduled to take on Timea Babos next - and Czech pair Katerina Siniakova and Kristyna Pliskova, who will face each other.
At the ASB Classic in Auckland, world number three and top seed Caroline Wozniacki moved into the quarter-finals with a 6-2 6-2 triumph over Croatian Petra Martic.
The Dane's next opponent will be Sofia Kenin, who beat fellow American Varvara Lepchenko in round two.
Wozniacki's fellow seeds in action on Wednesday - Julia Goerges (two), Barbora Strycova (three) and Agnieszka Radwanska (four) - also got through.
Karolina Pliskova, the world number four, booked her quarter-final spot at the Brisbane International as the Czech eased past American Catherine Bellis 6-1 6-1.
Elina Svitolina, ranked sixth in the world, will face Great Britain's world number nine Johanna Konta in the last eight after the Ukrainian beat Croatia's Ana Konjuh in their second-round match 6-3 6-1.
Kaia Kanepi - Pliskova's next opponent - and Aliaksandra Sasnovich also advanced to the quarters.