The 2023 Tennis Open Karlsruhe was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Karlsruhe, Germany between 3 and 9 July 2023.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 HUN
|
Zsombor Piros | 112 | 1 |
| Pavel Kotov | 116 | 2 | |
 ESP
|
Pedro Martínez | 122 | 3 |
 ITA
|
Giulio Zeppieri | 125 | 4 |
 BRA
|
Thiago Seyboth Wild | 131 | 5 |
 KAZ
|
Timofey Skatov | 138 | 6 |
| Ivan Gakhov | 143 | 7 | |
 CHI
|
Alejandro Tabilo | 144 | 8 |
- 1 Rankings are as of 26 June 2023.[1]
Other entrants
The following players received wildcards into the singles main draw:
Liam Gavrielides- Henri Squire
- Marko Topo
The following players received entry from the qualifying draw:
Champions
Singles
- Alejandro Tabilo def. Giulio Zeppieri 2–6, 1–0 ret.
Doubles
Neil Oberleitner / Tim Sandkaulen def. 
Vít Kopřiva / 
Michail Pervolarakis 6–1, 6–1.
References
- ^ "Rankings – Singles – ATP Tour – Tennis". ATP Tour.