| 2018 MercedesCup | |
|---|---|
| Date | 11–17 June |
| Edition | 41st |
| Category | ATP World Tour 250 series |
| Draw | 28S / 16D |
| Prize money | €656,015[1] |
| Surface | Grass |
| Location | Stuttgart, Germany |
| Venue | Tennis Club Weissenhof |
| Champions | |
| Singles | |
 Roger Federer[2] | |
| Doubles | |
 Philipp Petzschner / Tim Pütz[3] | |
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.
- ^ "Stuttgart - Overview - ATP Tour - Tennis".
- ^ "2018 Stuttgart Outdoor – Singles draw". Association of Tennis Professionals (ATP).
- ^ "2018 Stuttgart Outdoor – Doubles draw". Association of Tennis Professionals (ATP).