2018 Rogers Cup – Men's singles

Rafael Nadal defeated Stefanos Tsitsipas in the final, 6–2, 7–6(7–4) to win the men's singles tennis title at the 2018 Rogers Cup. It was his fourth Canadian Open title.

Alexander Zverev was the defending champion, but lost in the quarterfinals to Tsitsipas; Tsitsipas beat four top 10-ranked players en route to the final.

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

• 🇩🇪 Alexander Zverev (quarterfinals)

• 🇦🇷 Juan Martín del Potro (withdrew due to a left wrist injury)

• Kevin Anderson (semifinals)

• 🇧🇬 Grigor Dimitrov (quarterfinals)

• Marin Čilić (quarterfinals)

• 🇦🇹 Dominic Thiem (second round)

• 🇺🇸 John Isner (third round)

• 🇷🇸 Novak Djokovic (third round)

• 🇧🇪 David Goffin (first round)

• 🇦🇷 Diego Schwartzman (third round)

• 🇪🇸 Pablo Carreño Busta (second round)

• 🇺🇸 Jack Sock (first round)

• 🇮🇹 Fabio Fognini (second round)

• 🇪🇸 Roberto Bautista Agut (withdrew)

• 🇦🇺 Nick Kyrgios (first round)

Seeds
• # 🇺🇸 Ryan Harrison (qualified)

• # 🇺🇸 Jared Donaldson (moved to main draw)

• # 🇷🇺 Daniil Medvedev (qualified)

• # 🇹🇳 Malek Jaziri (first round)

• # 🇪🇸 Feliciano López (first round)

• # 🇷🇺 Evgeny Donskoy (qualified)

• # 🇫🇷 Pierre-Hugues Herbert (qualified)

• # 🇺🇸 Mackenzie McDonald (qualifying competition, lucky loser)

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

• # 🇷🇴 Marius Copil (first round)

• # 🇱🇹 Ričardas Berankis (first round)

• # 🇺🇸 Tim Smyczek (first round)

• # 🇷🇺 Mikhail Youzhny (qualifying competition, withdrew, lucky loser)

• # 🇸🇪 Elias Ymer (qualifying competition, withdrew)

• # 🇺🇸 Bradley Klahn (qualified)

Qualifiers
• # 🇺🇸 Ryan Harrison

• # 🇺🇸 Bradley Klahn

• # 🇷🇺 Daniil Medvedev

• # 🇯🇵 Yoshihito Nishioka

• # 🇧🇾 Ilya Ivashka

• # 🇷🇺 Evgeny Donskoy

• # 🇫🇷 Pierre-Hugues Herbert

Lucky losers
• # 🇺🇸 Mackenzie McDonald

• # 🇧🇦 Mirza Bašić

• # 🇷🇺 Mikhail Youzhny