Which career-best result highlighted September? It's time to vote for the latest WTA Breakthrough of the Month.

A pair of first-time WTA title-winners highlight the ballot, as Rebecca Peterson and Karolina Muchova were crown champions in Nanchang and Seoul for their first tour-level hardware.

Rounding out the nominees are two players who made waves at the Dongfeng Motor Wuhan Open in Alison Riske and Elena Rybakina, who had career-best showings at Premier 5 level. 

Revisit the nominees in the video below and cast your vote for your favorite before voting ends Saturday at 11:59 p.m. ET!

Who was the September Breakthrough of the Month? Vote now!

The winners will be announced in the week of Oct. 14.

Finalists are selected by wtatennis.com
Winner is then determined by a fan vote on wtatennis.com

Previous WTA Breakthroughs of the Month for 2019
January: Dayana Yastremska
February: Hsieh Su-wei
March: Bianca Andreescu

April: Maria Sakkari
May: Marketa Vondrousova
June: Iga Swiatek
July: Barbora Strycova

August: Marie Bouzkova