2018 Swiss Open – Women's Singles

Main article: 2018 Swiss Open

A WTA player was the defending champion from 2017.

Seeds
🇩🇪 Angelique Kerber Caroline Wozniacki 🇺🇦 Elina Svitolina 🇺🇸 Sloane Stephens 🇨🇿 Petra Kvitová 🇨🇿 Karolína Plíšková Kiki Bertens 🇷🇺 Daria Kasatkina 🇧🇾 Aryna Sabalenka Anastasija Sevastova 🇧🇪 Elise Mertens 🇩🇪 Julia Görges 🇦🇺 Ashleigh Barty 🇺🇸 Serena Williams 🇪🇸 Garbiñe Muguruza 🇫🇷 Caroline Garcia

🇨🇳 Wang Qiang 🇪🇪 Anett Kontaveit 🇪🇸 Carla Suárez Navarro 🇷🇴 Mihaela Buzărnescu 🇸🇰 Dominika Cibulková 🇮🇹 Camila Giorgi 🇺🇦 Lesia Tsurenko Hsieh Su-wei 🇧🇾 Aliaksandra Sasnovich 🇨🇿 Kateřina Siniaková Petra Martić 🇨🇿 Barbora Strýcová Donna Vekić 🇨🇳 Zhang Shuai 🇺🇸 Danielle Collins Belinda Bencic