- Source: 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.
Singles main-draw entrants
= 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
Champions
= Singles
=Nerman Fatić def. Damir Džumhur 6–2, 6–4.
= Doubles
=Andrew Paulson / Michael Vrbenský def. Piotr Matuszewski / Kai Wehnelt 6–2, 6–2.