Three players stood out over the first half of the Asian swing this September, but only one will earn the votes to be your Player of the Month.
Have a look at the nominees and cast your vote before Thursday at 11:59 p.m. ET! The winner will be announced Friday, October 5.
September 2018 WTA Player of the Month Finalists
Naomi Osaka: Osaka had no letdown after winning her first Grand Slam title at the US Open, putting the August Player of the Month on her second straight ballot in September.
The Japanese No.1 returned to home soil in style, as she extended her winning streak to 10 straight matches by reaching the final of the Toray Pan Pacific Open for the second time in her career, losing out to Karolina Pliskova in two tight sets.
Over the course of the week, Osaka defeated Dominika Cibulkova, Barbora Strycova and Camila Giorgi without losing a set.
Karolina Pliskova: Pliskova won her second title of the season in Tokyo, as she rounded into form from the brink of defeat in seemingly every match at the Toray Pan Pacific Open.
The Czech was taken to three sets in each of her first three matches in Tokyo, and battled back from a late deficit in all of them.
She came from a break down in the third set in the second round against Daria Gavrilova and the semifinals against Donna Vekic, and also saved match points in her quarterfinal victory against Alison Riske.
"Sometimes you have your toughest match in the final," she said, after beating Osaka in straight sets to claim the title. "And sometimes you have to fight so hard to get there and suddenly comes the easier match. It was important for me to play two sets and not go three sets...and I needed a match like this.
"Ihe confidence is getting higher and higher with every match win; I won a lot of tough matches against tough opponents here. With every win I feel better and better."
Aryna Sabalenka: The season of Sabalenka continued at the Dongfeng Motor Wuhan Open, as the Belarusian powered to her second title of the year and the biggest of her career to date at the Premier 5 event.
The 20-year-old won six matches in Wuhan, which included another Top 10 victory over Elina Svitolina in the second round, and didn't drop a set in her last four matches.
She defeated American Sofia Kenin, Dominika Cibulkova, 2017 runner-up Ashleigh Barty to reach the final, where she came out the victor in an all-unseeded affair against Estonia's Anett Kontaveit.
The Belarusian rose to a career-high ranking of World No.16 as a result of the win, and firmly into contention on the Porsche Race to Singapore.
Who is your Player of the Month for September? Vote now!
How it works:
Finalists are selected by wtatennis.com
Winner is then determined by a fan vote on wtatennis.com
Previous WTA Players of the Month for 2018
January: Simona Halep
February: Petra Kvitova
March: Naomi Osaka
April: Karolina Pliskova
May: Simona Halep
June: Petra Kvitova
July: Angelique Kerber
August: Naomi Osaka