2023 Sibiu Open
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The 2023 Sibiu Open was a professional tennis tournament played on clay courts. It was the 12th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Sibiu, Romania between 18 and 24 September 2023.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| HUN | Zsombor Piros | 111 | 1 |
| ITA | Flavio Cobolli | 132 | 2 |
| BIH | Damir Džumhur | 157 | 3 |
| Ivan Gakhov | 161 | 4 | |
| ITA | Stefano Travaglia | 205 | 5 |
| CRO | Duje Ajduković | 206 | 6 |
| ITA | Alessandro Giannessi | 214 | 7 |
| BIH | Nerman Fatić | 218 | 8 |
- 1 Rankings are as of 11 September 2023.
Other entrants
The following players received wildcards into the singles main draw:
- Slovenia Bor Artnak
- Romania Cezar Crețu
- Romania Sebastian Gima
The following players received entry from the qualifying draw:
- Romania Vlad Andrei Dancu
- France Calvin Hemery
- Romania Filip Cristian Jianu
- Switzerland Henri Laaksonen
- Czech Republic Andrew Paulson
- Czech Republic Michael Vrbenský
Champions
Singles
- Bosnia and Herzegovina Nerman Fatić def. Bosnia and Herzegovina Damir Džumhur 6–2, 6–4.
Doubles
- Czech Republic Andrew Paulson / Czech Republic Michael Vrbenský def. Poland Piotr Matuszewski / Germany Kai Wehnelt 6–2, 6–2.