Kiki Bertens had a history-making month for herself and her country in May.
At the Mutua Madrid Open, the Dutchwoman won her first Premier Mandatory title, and became the first woman to win the event without losing a set.
Read the match report: Brilliant Bertens triumphs over Halep to claim Madrid Open crown
She bear four former Grand Slam champions along the way - Jelena Ostapenko, Petra Kvitova, Sloane Stephens, and Simona Halep in the final - to achieve her feat, and ascended to a new career-high ranking of World No.4 as a result.
By rising to that ranking, she also became the highest-ranking Dutch woman in the history of the WTA. She ultimately authored an eight-match winning streak, as she also reached the semifinals in Rome.
Final Results for May's Player of the Month
1. Kiki Bertens
2. Simona Halep
3. Karolina Pliskova
4. Johanna Konta
How it works:
Finalists are selected by wtatennis.com
Winner is then determined by a fan vote on wtatennis.com