2018 Connecticut Open – Singles

Daria Gavrilova was the defending champion, but lost to Aryna Sabalenka in the second round.

Sabalenka went on to win her first WTA Tour title, defeating Carla Suárez Navarro in the final, 6–1, 6–4. Suárez Navarro reached the final despite playing only one completed match in the first four rounds.

Seeds
The top two seeds received byes into the second round. • #🇷🇴 Simona Halep (withdrew)

• #🇫🇷 Caroline Garcia (quarterfinals)

• #🇨🇿 Petra Kvitová (quarterfinals, retired)

• #🇨🇿 Karolína Plíšková (first round)

• #🇩🇪 Julia Görges (semifinals)

• #🇦🇺 Ashleigh Barty (withdrew)

• # Kiki Bertens (withdrew)

• #🇨🇿 Barbora Strýcová (first round)

• #🇦🇺 Daria Gavrilova (second round)

Seeds
• # 🇧🇾 Aliaksandra Sasnovich (qualified)

• # 🇧🇪 Alison Van Uytvanck (first round)

• # 🇮🇹 Camila Giorgi (qualified)

• # Hsieh Su-wei (second round)

• # Belinda Bencic (qualifying competition, lucky loser)

• # 🇧🇪 Kirsten Flipkens (second round)

• # 🇰🇿 Yulia Putintseva (first round)

• # Petra Martić (first round, retired)

• # 🇨🇿 Kateřina Siniaková (withdrew, still competing in Cincinnati)

• # 🇸🇰 Viktória Kužmová (first round)

• # 🇵🇱 Magda Linette (second round)

• # 🇷🇴 Monica Niculescu (first round)

Qualifiers
• # 🇧🇾 Aliaksandra Sasnovich

• # 🇷🇴 Ana Bogdan

• # 🇮🇹 Camila Giorgi

• # Monica Puig

• # 🇺🇦 Dayana Yastremska

• # 🇰🇿 Zarina Diyas

Lucky losers
• # 🇦🇺 Samantha Stosur

• # Belinda Bencic

• # 🇫🇷 Pauline Parmentier