2023 Koblenz Open
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The 2023 Koblenz Open powered by Montabaur was a professional tennis tournament played on indoor hard courts. It was the fifth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Koblenz, Germany from 30 January to 5 February 2023.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| CHN | Zhang Zhizhen | 96 | 1 |
| Roman Safiullin | 97 | 2 | |
| CAN | Vasek Pospisil | 99 | 3 |
| GER | Maximilian Marterer | 142 | 4 |
| FRA | Hugo Grenier | 147 | 5 |
| GBR | Liam Broady | 158 | 6 |
| FRA | Alexandre Müller | 160 | 7 |
| NED | Gijs Brouwer | 161 | 8 |
- 1 Rankings are as of 16 January 2023.
Other entrants
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
- Belgium Raphaël Collignon
- Germany Lucas Gerch
- Netherlands Robin Haase
- Germany Daniel Masur
- Germany Louis Wessels
The following players received entry from the qualifying draw:
- Germany Johannes Härteis
- France Antoine Hoang
- Germany Mats Rosenkranz
- Ukraine Vitaliy Sachko
- Alexey Vatutin
- Kazakhstan Denis Yevseyev
Champions
Singles
- Roman Safiullin def. Canada Vasek Pospisil 6–2, 7–5.
Doubles
- Germany Fabian Fallert / Germany Hendrik Jebens def. France Jonathan Eysseric / Ukraine Denys Molchanov 7–6(7–2), 6–3.