Virginie Razzano was the defending champion, but chose not to participate that year.
Jelena Janković was the two-time defending champion, but lost in the quarterfinals to Svetlana Kuznetsova.
Venus Williams was the two-time defending champion, but withdrew before the tournament started due to injury.
Aravane Rezaï was the defending champion; however, she was eliminated by Sofia Arvidsson in the first round.
María José Martínez Sánchez was the defending champion, but lost in the first round to Ekaterina Makarova.
World No. 1 Caroline Wozniacki was the defending champion, but lost to Kaia Kanepi in the third round.
Victoria Azarenka was the defending champion, but chose to compete at the BGL Luxembourg Open instead. Dominika Cibulková won the title defeating Kaia Kanepi in the final to earn her first WTA tour title.
Li Na was the defending champion, but lost the final against Victoria Azarenka, 6–2, 1–6, 6–3.
Kiki Bertens was the defending champion, but lost in the quarterfinals to Lourdes Domínguez Lino.
Francesca Schiavone won the title, defeating Domínguez Lino in the final, 6–1, 6–3.
Agnieszka Radwańska was the defending champion but decided not to participate.
Kaia Kanepi won the title, defeating Peng Shuai in the final, 6–2, 7–5.
Serena Williams successfully defended her title, beating Li Na in the final, 7–5, 6–1. This was Williams' record seventh Miami title.
Timea Bacsinszky was the defending champion, but chose not to participate.
Simona Halep was the defending champion, but lost in the second round to Magdaléna Rybáriková.
Petra Kvitová won the title, defeating Rybáriková in the final, 6–4, 6–2.
Kaia Kanepi was the defending champion, but lost in the first round to Amra Sadiković.
Carina Witthöft was the defending champion, but chose not to participate.
Anastasia Pavlyuchenkova was the defending champion, but lost to unseeded Svetlana Kuznetsova in the final, 2–6, 1–6.
Svetlana Kuznetsova was the two-time defending champion, but withdrew before the tournament began.
Elina Svitolina was the defending champion and successfully defended her title, defeating Simona Halep in the rematch of last year's final, 6–0, 6–4.
Garbiñe Muguruza was the defending champion, but lost in the second round to Lesia Tsurenko.
