2018 Monte-Carlo Masters – Singles

Two-time defending champion Rafael Nadal defeated Kei Nishikori in the final, 6–3, 6–2 to win the singles tennis title at the 2018 Monte-Carlo Masters. It was his record-extending 11th Monte-Carlo Masters title and his record 31st Masters title. By winning the title, Nadal also retained the ATP no. 1 singles ranking. He did not lose a single set during the tournament.

Seeds
The top eight seeds receive a bye into the second round. • 🇪🇸 Rafael Nadal (champion)

• Marin Čilić (quarterfinals)

• 🇩🇪 Alexander Zverev (semifinals)

• 🇧🇬 Grigor Dimitrov (semifinals)

• 🇦🇹 Dominic Thiem (quarterfinals)

• 🇧🇪 David Goffin (quarterfinals)

• 🇫🇷 Lucas Pouille (second round)

• 🇪🇸 Pablo Carreño Busta (withdrew)

• 🇷🇸 Novak Djokovic (third round)

• 🇦🇷 Diego Schwartzman (second round)

• 🇪🇸 Roberto Bautista Agut (third round)

• 🇨🇿 Tomáš Berdych (first round)

• 🇮🇹 Fabio Fognini (second round)

• 🇨🇦 Milos Raonic (third round, withdrew due to knee injury)

• 🇪🇸 Albert Ramos Viñolas (second round)

• 🇫🇷 Adrian Mannarino (first round)

Seeds
• # 🇮🇹 Andreas Seppi (qualified)

• # 🇪🇸 Guillermo García López (qualifying competition, lucky loser)

• # 🇷🇸 Viktor Troicki (first round)

• # Stefanos Tsitsipas (qualified)

• # 🇩🇪 Maximilian Marterer (first round)

• # 🇩🇪 Florian Mayer (qualifying competition, lucky loser)

• # 🇦🇷 Federico Delbonis (first round)

• # 🇪🇸 Roberto Carballés Baena (first round)

• # 🇫🇷 Pierre-Hugues Herbert (qualified)

• # 🇫🇷 Jérémy Chardy (qualified)

• # 🇺🇿 Denis Istomin (first round)

• # 🇷🇸 Dušan Lajović (qualified)

• # 🇰🇿 Mikhail Kukushkin (first round)

• # 🇧🇦 Mirza Bašić (qualifying competition, lucky loser)

Qualifiers
• # 🇮🇹 Andreas Seppi

• # 🇮🇹 Marco Cecchinato

• # 🇷🇸 Dušan Lajović

• # Stefanos Tsitsipas

• # 🇫🇷 Pierre-Hugues Herbert

• # 🇧🇾 Ilya Ivashka

• # 🇫🇷 Jérémy Chardy

Lucky losers
• # 🇩🇪 Florian Mayer

• # 🇧🇦 Mirza Bašić

• # 🇪🇸 Guillermo García López