2018 MercedesCup

The 2018 MercedesCup was a men's tennis tournament played on outdoor grass courts. It was the 41st edition of the Stuttgart Open, and part of the ATP World Tour 250 series of the 2018 ATP World Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 11 June until 17 June 2018. First-seeded Roger Federer regained the ATP no. 1 singles ranking by reaching the final.

Singles
Roger Federer defeated 🇨🇦 Milos Raonic, 6–4, 7–6(7–3)
 * It was Federer's 3rd singles title of the year and the 98th of his career.

Doubles
🇩🇪 Philipp Petzschner / 🇩🇪 Tim Pütz defeated 🇸🇪 Robert Lindstedt / 🇵🇱 Marcin Matkowski, 7–6(7–5), 6–3

Seeds

 * 1 Rankings are as of May 28, 2018

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇿 Tomáš Berdych
 * 🇩🇪 Yannick Maden
 * 🇩🇪 Rudolf Molleker

The following players received entry from the qualifying draw:
 * 🇮🇳 Prajnesh Gunneswaran
 * 🇺🇸 Denis Kudla
 * 🇮🇹 Matteo Viola
 * 🇷🇺 Mikhail Youzhny

The following player received entry as a lucky loser:
 * Viktor Galović

Withdrawals

 * Before the tournament
 * 🇮🇹 Marco Cecchinato → replaced by 🇺🇿 Denis Istomin
 * 🇩🇪 Peter Gojowczyk → replaced by Viktor Galović
 * 🇰🇷 Chung Hyeon → replaced by 🇩🇪 Maximilian Marterer
 * 🇪🇸 David Ferrer → replaced by 🇧🇦 Mirza Bašić
 * 🇫🇷 Gaël Monfils → replaced by 🇩🇪 Florian Mayer

Retirements

 * 🇷🇸 Viktor Troicki

Seeds

 * Rankings are as of May 28, 2018

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇩🇪 Matthias Bachinger / 🇩🇪 Yannick Maden
 * 🇩🇪 Philipp Petzschner / 🇩🇪 Tim Pütz