| 2018 Koblenz Open | |
|---|---|
| Date | 16–21 January |
| Edition | 2nd |
| Surface | Hard (indoor) |
| Location | Koblenz, Germany |
| Champions | |
| Singles | |
 Mats Moraing | |
| Doubles | |
 Romain Arneodo /  Tristan-Samuel Weissborn | |
The 2018 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Koblenz, Germany between 16 and 21 January 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RUS | Andrey Kuznetsov | 104 | 1 |
 ITA | Marco Cecchinato | 106 | 2 |
 UKR | Sergiy Stakhovsky | 122 | 3 |
| GER | Oscar Otte | 133 | 4 |
| GER | Yannick Maden | 146 | 5 |
 FRA | Kenny de Schepper | 154 | 6 |
 SVK | Andrej Martin | 159 | 7 |
 ESP | Tommy Robredo | 163 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Joris De Loore Christopher Heyman Filip Horanský 
Mikael Ymer Mats Moraing def. Kenny de Schepper 6–2, 6–1. Romain Arneodo / Tristan-Samuel Weissborn def. 
Sander Arends / 
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