2018 Kremlin Cup – Men's singles

Damir Džumhur was the defending champion, but lost to Egor Gerasimov in the first round.

Karen Khachanov won the title, defeating Adrian Mannarino in the final, 6–2, 6–2.

Seeds
The top four seeds received a bye into the second round. • #🇮🇹 Marco Cecchinato (second round)

• #🇷🇺 Daniil Medvedev (semifinals)

• #🇷🇺 Karen Khachanov (champion)

• #🇷🇸 Filip Krajinović (quarterfinals)

• #🇦🇺 Nick Kyrgios (second round, withdrew due to elbow injury)

• #🇧🇦 Damir Džumhur (first round)

• #🇫🇷 Jérémy Chardy (withdrew)

• #🇸🇰 Martin Kližan (first round)

Seeds
• # 🇱🇹 Ričardas Berankis (qualifying competition, lucky loser)

• # 🇨🇿 Lukáš Rosol (qualified)

• # 🇷🇸 Nikola Milojević (first round)

• # 🇷🇺 Alexey Vatutin (first round)

• # 🇩🇪 Daniel Brands (first round)

• # 🇧🇾 Uladzimir Ignatik (first round)

• # 🇩🇪 Rudolf Molleker (first round)

• # Viktor Galović (first round)

Qualifiers
• # 🇰🇿 Alexander Bublik

• # 🇨🇿 Lukáš Rosol

• # 🇸🇰 Filip Horanský

• # 🇧🇾 Egor Gerasimov

Lucky loser

 * 1) 🇱🇹 Ričardas Berankis