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

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