2018 Qatar ExxonMobil Open – Singles

Gaël Monfils defeated Andrey Rublev in the final, 6–2, 6–3 to win the singles tennis title at the 2018 Qatar Open.

Novak Djokovic was the two-time reigning champion, but withdrew before the tournament due to an elbow injury.

Seeds
• # 🇦🇹 Dominic Thiem (semifinals, withdrew due to illness)

• # 🇪🇸 Pablo Carreño Busta (first round)

• # 🇨🇿 Tomáš Berdych (first round)

• # 🇪🇸 Albert Ramos Viñolas (first round)

• # 🇫🇷 Richard Gasquet (second round)

• # 🇷🇸 Filip Krajinović (first round)

• # 🇪🇸 Fernando Verdasco (second round)

• # 🇪🇸 Feliciano López (second round)

Seeds
• # 🇮🇹 Andreas Seppi (qualifying competition)

• # 🇩🇪 Maximilian Marterer (qualifying competition)

• # Stefanos Tsitsipas (qualified)

• # 🇩🇪 Dustin Brown (first round)

• # Pedro Sousa (first round, retired)

• # 🇮🇹 Stefano Travaglia (qualified)

• # 🇮🇹 Matteo Berrettini (qualified)

• # 🇧🇦 Mirza Bašić (qualified)

Qualifiers
• # 🇧🇦 Mirza Bašić

• # 🇮🇹 Matteo Berrettini

• # Stefanos Tsitsipas

• # 🇮🇹 Stefano Travaglia