2018 Bucharest Open – Singles

Irina-Camelia Begu was the defending champion, but lost to Ons Jabeur in the first round.

Anastasija Sevastova won the title, defeating Petra Martić in the final, 7–6(7–4), 6–2.

Seeds
• # Anastasija Sevastova (champion)

• #🇷🇴 Mihaela Buzărnescu (semifinals)

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

• # Petra Martić (final)

• #🇷🇴 Sorana Cîrstea (quarterfinals)

• #🇷🇴 Ana Bogdan (first round)

• #🇫🇷 Pauline Parmentier (second round, retired)

• # Polona Hercog (semifinals, retired)

Seeds
• # 🇮🇹 Deborah Chiesa (first round)

• # 🇷🇴 Irina Bara (qualified)

• # 🇪🇸 Georgina García Pérez (qualifying competition)

• # 🇪🇸 Paula Badosa Gibert (qualifying competition)

• # 🇹🇷 Çağla Büyükakçay (qualified)

• # 🇷🇸 Dejana Radanović (second round)

• # 🇰🇿 Elena Rybakina (second round)

• # 🇧🇬 Sesil Karatantcheva (first round)

Qualifiers
• # 🇸🇰 Rebecca Šramková

• # 🇷🇴 Irina Bara

• # 🇹🇷 Çağla Büyükakçay

• # 🇺🇸 Claire Liu