It was a Sunshine Swing to remember for several WTA stars, but four players made us stand up and take notice.

Did Bianca Andreescu, Marketa Vondrousova, Hsieh Su-wei or Anett Kontaveit have the biggest breakthrough result in March? Tell us with your votes!

Cast your vote for the player you believe most deserving of Breakthrough of the Month by Thursday at 11:59 p.m. ET. 

Bianca Andreescu: The Canadian teenager announced herself in a big way during the Sunshine Swing, becoming the youngest player in over a decade to win the BNP Paribas Open in Indian Wells and following that up with a fourth-round showing in Miami.

In all, Andreescu boasted a 10-match winning streak in the month, taking out a whole host of WTA stars, and soaring up the WTA rankings into the Top 40.

The teenager scored two notable victories over Angelique Kerber, including one from a break down in the third set in the final to win Indian Wells, Elina Svitolina, Wang Qiang, and Garbiñe Muguruza, among others, in her sizzling spring.

Anett Kontaveit: Kontaveit surged into the semfiinals of the Miami Open, and made history for Estonia along the way.

Kontaveit defeated Amanda Anisimova, Alja Tomlajnovic, Andreescu, Hsieh Su-wei before falling to eventual champion Ashleigh Barty at the Premier Mandatory event, but rose to a new career-high ranking of World No.14 as a result.

That mark betters the career-best ranking of Kaia Kanepi (World No.15) to become the new best ranking for a player from Estonia all-time in WTA history. 

Marketa Vondrousova: Czech teenager Vondrousova had back-to-back quarterfinal showings in Indian Wells and Miami, as she made a splash in two of the season's biggest events.

She first defeated three seeds at the BNP Paribas Open, beginning with No.14 seed Daria Kasatkina with the loss of just three games, and later came from a set down to beat Jelena Ostapenko before shocking Simona Halep for her biggest career victory to date.

In Miami, Vondrousova kept rolling thanks to another win over Ostapenko and an upset of Doha champion Elise Mertens, before her run was ended by compatriot and eventual runner-up Karolina Pliskova in the last eight.

Hsieh Su-wei: The February Breakthrough Player of the Month, Hsieh kept the good vibes rolling into the Sunshine Swing.

The veteran had her best-ever showing in a Premier Mandatory event in Miami by virute of reaching the quarterfinals, which included wins over Naomi Osaka and Caroline Wozniacki along the way.

The victory over Osaka was Hsieh's second over a reigning World No.1 in her career, and flipped the result of their match from the Australian Open in January, where it was Osaka who rallied from a one-set deficit en route to winning the title.

Who was your Breakthrough of the Month? Vote now!

The winner will be announced on Friday, April 5.


How it works:

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