2023 Sibiu Open

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.

Seeds

 * 1 Rankings are as of 11 September 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * Bor Artnak
 * 🇷🇴 Cezar Crețu
 * 🇷🇴 Sebastian Gima

The following players received entry from the qualifying draw:
 * 🇷🇴 Vlad Andrei Dancu
 * 🇫🇷 Calvin Hemery
 * 🇷🇴 Filip Cristian Jianu
 * Henri Laaksonen
 * 🇨🇿 Andrew Paulson
 * 🇨🇿 Michael Vrbenský

Singles

 * 🇧🇦 Nerman Fatić def. 🇧🇦 Damir Džumhur 6–2, 6–4.

Doubles

 * 🇨🇿 Andrew Paulson / 🇨🇿 Michael Vrbenský def. 🇵🇱 Piotr Matuszewski / 🇩🇪 Kai Wehnelt 6–2, 6–2.