Elena Dementieva was the defending champion, but chose not to participate this year.
María José Martínez Sánchez was the defending champion but decided not to participate.
Alizé Cornet won the title defeating Yanina Wickmayer in the final, 7–5, 7–6(7–1)
Kristina Mladenovic was the defending champion, but decided not to participate.
Victoria Azarenka was the defending champion, but withdrew because of a right knee injury.
Eugenie Bouchard was the defending champion, but chose not to participate this year.
Agnieszka Radwańska was the defending champion, but lost in the quarterfinals to Simona Halep.
This is the first edition of the tournament as part of the WTA 125K Series.
Sloane Stephens was the defending champion, but lost in the first round to Risa Ozaki.
Yanina Wickmayer was the defending champion, but lost in the first round to Viktorija Golubic.
Sloane Stephens was the defending champion, but did not participate this year as she was recovering from foot surgery.
Magda Linette was the defending champion, but she chose to participate at the 2017 Mutua Madrid Open instead.
Monica Niculescu was the defending champion, but lost in the first round to Pauline Parmentier.
This was the first edition of the tournament.
This was the first edition of the tournament.
Danielle Collins was the defending champion, but chose not to participate as she was still competing at the Australian Open.
Madison Brengle was the defending champion but lost to Caty McNally in the quarterfinals.
Kristýna Plíšková and Evgeniya Rodina won the title, defeating defending champions Taylor Townsend and Yanina Wickmayer, in the final, 7–6(9–7), 6–4.
Ashleigh Barty defeated Karolína Plíšková in the final, 7–6(7–1), 6–3 to win the women's singles tennis title at the 2019 Miami Open. It was Barty's first WTA Premier Mandatory title. She entered the top 10 in the WTA rankings for the first time with the win.
Bianca Andreescu was the defending champion, but chose not to participate this year.
Kristýna Plíšková and Evgeniya Rodina were the defending champions, but chose not to defend their title.
Hayley Carter 
Yanina Wickmayer 
