2017 Western & Southern Open – Women's singles

Garbiñe Muguruza defeated Simona Halep in the final, 6–1, 6–0 to win the women's singles tennis title at the 2017 Cincinnati Masters. By losing in the final, Halep failed to take advantage of her third opportunity in 2017 to take over the WTA No. 1 singles ranking when the top ranking was only one match win away.

Karolína Plíšková was the defending champion, but lost in the semifinals to Muguruza.

Seeds
The top eight seeds received a bye into the second round. • 🇨🇿 Karolína Plíšková (semifinals)

• 🇷🇴 Simona Halep (final)

• 🇩🇪 Angelique Kerber (second round)

• 🇪🇸 Garbiñe Muguruza (champion)

• 🇺🇦 Elina Svitolina (third round)

• Caroline Wozniacki (quarterfinals)

• 🇬🇧 Johanna Konta (quarterfinals)

• 🇷🇺 Svetlana Kuznetsova (quarterfinals)

• 🇺🇸 Venus Williams (second round)

• 🇵🇱 Agnieszka Radwańska (first round)

• 🇸🇰 Dominika Cibulková (third round)

• Jeļena Ostapenko (first round)

• 🇫🇷 Kristina Mladenovic (first round)

• 🇨🇿 Petra Kvitová (second round)

• Anastasija Sevastova (third round)

• 🇺🇸 Madison Keys (third round)

Seeds
• # 🇸🇰 Magdaléna Rybáriková (qualifying competition)

• # 🇧🇪 Elise Mertens (first round)

• # 🇩🇪 Mona Barthel (first round)

• # Donna Vekić (qualified)

• # 🇸🇪 Johanna Larsson (first round)

• # 🇷🇴 Sorana Cîrstea (first round)

• # 🇷🇴 Monica Niculescu (first round)

• # 🇦🇺 Ashleigh Barty (qualified)

• # 🇷🇴 Irina-Camelia Begu (first round)

• # 🇷🇺 Natalia Vikhlyantseva (qualifying competition, lucky loser)

• # 🇺🇸 Christina McHale (first round)

• # 🇪🇸 Lara Arruabarrena (first round)

• # 🇩🇪 Carina Witthöft (qualifying competition)

• # 🇺🇸 Varvara Lepchenko (qualified)

• # Monica Puig (qualified)

• # 🇬🇧 Heather Watson (first round)

• # Verónica Cepede Royg (qualified)

• # 🇮🇹 Francesca Schiavone (qualifying competition)

• # 🇧🇷 Beatriz Haddad Maia (qualified)

• # 🇯🇵 Misaki Doi (first round)

• # 🇷🇺 Evgeniya Rodina (first round)

• # 🇮🇹 Camila Giorgi (qualified)

• # 🇧🇪 Kirsten Flipkens (qualifying competition)

• # 🇵🇱 Magda Linette (qualified)

Qualifiers
• # 🇮🇹 Camila Giorgi

• # 🇧🇾 Aliaksandra Sasnovich

• # 🇵🇱 Magda Linette

• # Donna Vekić

• # 🇧🇷 Beatriz Haddad Maia

• # 🇷🇸 Aleksandra Krunić

• # Monica Puig

• # 🇦🇺 Ashleigh Barty

• # 🇺🇸 Taylor Townsend

• # 🇨🇦 Françoise Abanda

• # Verónica Cepede Royg

• # 🇺🇸 Varvara Lepchenko

Lucky losers

 * 1) 🇷🇺 Natalia Vikhlyantseva