2018 MercedesCup – Singles

Lucas Pouille was the defending champion, but lost in the semifinals to Milos Raonic.

Roger Federer won his first title in Stuttgart, defeating Raonic in the final, 6–4, 7–6(7–3). By reaching the final, Federer regained the ATP no. 1 singles ranking. This was his record extending 18th Grass Court Title and his final ATP 250 title before retiring in 2021.

Seeds
The top four seeds receive a bye into the second round. • # Roger Federer (champion)

• # 🇫🇷 Lucas Pouille (semifinals)

• # 🇨🇿 Tomáš Berdych (quarterfinals)

• # 🇦🇺 Nick Kyrgios (semifinals)

• # 🇩🇪 Philipp Kohlschreiber (first round)

• # 🇨🇦 Denis Shapovalov (first round)

• # 🇨🇦 Milos Raonic (final)

• # 🇪🇸 Feliciano López (quarterfinals)

Seeds
• # 🇷🇺 Mikhail Youzhny (qualified)

• # 🇸🇰 Lukáš Lacko (first round)

• # 🇧🇪 Ruben Bemelmans (first round)

• # 🇺🇸 Denis Kudla (qualified)

• # 🇩🇪 Matthias Bachinger (first round)

• # 🇸🇰 Andrej Martin (first round)

• # Viktor Galović (qualifying competition, lucky loser)

• # 🇮🇳 Prajnesh Gunneswaran (qualified)

Qualifiers
• # 🇷🇺 Mikhail Youzhny

• # 🇮🇹 Matteo Viola

• # 🇮🇳 Prajnesh Gunneswaran

• # 🇺🇸 Denis Kudla

Lucky loser
• # Viktor Galović