2019 Miami Open – Women's singles

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.

Sloane Stephens was the defending champion, but lost in the third round to Tatjana Maria.

Naomi Osaka retained the WTA No. 1 singles ranking after Simona Halep lost in the semifinals. Petra Kvitová, Angelique Kerber, and Elina Svitolina were also in contention for the top ranking.

Seeds
All seeds received a bye into the second round. • 🇯🇵 Naomi Osaka (third round)

• 🇷🇴 Simona Halep (semifinals)

• 🇨🇿 Petra Kvitová (quarterfinals)

• 🇺🇸 Sloane Stephens (third round)

• 🇨🇿 Karolína Plíšková (final)

• 🇺🇦 Elina Svitolina (second round)

• Kiki Bertens (fourth round)

• 🇩🇪 Angelique Kerber (third round)

• 🇧🇾 Aryna Sabalenka (second round)

• 🇺🇸 Serena Williams (third round, withdrew)

•  Anastasija Sevastova (third round)

• 🇦🇺 Ashleigh Barty (champion)

•  Caroline Wozniacki (fourth round)

• 🇷🇺 Daria Kasatkina (third round)

• 🇩🇪 Julia Görges (third round)

• 🇧🇪 Elise Mertens (third round)

• 🇺🇸 Madison Keys (second round)

• 🇨🇳 Wang Qiang (quarterfinals)

• 🇫🇷 Caroline Garcia (fourth round)

• 🇪🇸 Garbiñe Muguruza (second round)

• 🇪🇪 Anett Kontaveit (semifinals)

•  Jeļena Ostapenko (second round)

•  Belinda Bencic (second round)

• 🇪🇸 Carla Suárez Navarro (second round)

• 🇺🇸 Danielle Collins (third round)

•  Donna Vekić (third round)

•  Hsieh Su-wei (quarterfinals)

• 🇺🇦 Lesia Tsurenko (withdrew)

• 🇮🇹 Camila Giorgi (second round)

• 🇷🇴 Mihaela Buzărnescu (second round)

• 🇷🇺 Anastasia Pavlyuchenkova (second round)

• 🇺🇸 Sofia Kenin (second round)

Seeds
• # 🇷🇺 Anastasia Potapova (first round)

• # 🇨🇦 Eugenie Bouchard (first round)

• # Dalila Jakupović (qualified)

• # Viktorija Golubic (qualified)

• # 🇺🇸 Jennifer Brady (first round)

• # 🇬🇧 Katie Boulter (first round)

• # 🇪🇪 Kaia Kanepi (qualified)

• # 🇺🇸 Bernarda Pera (first round, retired)

• # 🇪🇸 Lara Arruabarrena (first round)

• # 🇺🇸 Taylor Townsend (qualified)

• # 🇨🇿 Kristýna Plíšková (qualifying competition, lucky loser)

• # Polona Hercog (qualifying competition, lucky loser)

• # 🇵🇱 Magda Linette (qualifying competition)

• # 🇺🇸 Jessica Pegula (qualified)

• # 🇰🇿 Zarina Diyas (first round)

• # 🇨🇳 Zhu Lin (first round)

• # 🇺🇸 Madison Brengle (qualifying competition)

• # 🇩🇪 Mona Barthel (qualifying competition)

• # 🇷🇴 Sorana Cîrstea (first round)

• # 🇱🇺 Mandy Minella (qualifying competition)

• # 🇷🇺 Veronika Kudermetova (first round)

• # 🇷🇺 Vitalia Diatchenko (first round)

• # 🇭🇺 Tímea Babos (qualifying competition)

• # 🇷🇺 Anna Blinkova (first round)

Qualifiers
• # 🇯🇵 Misaki Doi

• # 🇯🇵 Nao Hibino

• # Dalila Jakupović

• # Viktorija Golubic

• # 🇺🇸 Sachia Vickery

• # 🇨🇿 Karolína Muchová

• # 🇪🇪 Kaia Kanepi

• # 🇺🇸 Jessica Pegula

• # 🇷🇴 Monica Niculescu

• # 🇺🇸 Taylor Townsend

• # 🇧🇪 Yanina Wickmayer

• # 🇩🇪 Laura Siegemund

Lucky losers
• # 🇨🇿 Kristýna Plíšková

• # Polona Hercog