The 2018 Sibiu Open was a professional tennis tournament played on clay courts. It was the seventh edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Sibiu, Romania between 17 and 23 September 2018.
Singles main-draw entrants
Seeds
1 Rankings are as of 10 September 2018.
Other entrants
The following players received wildcards into the singles main draw: Victor Vlad Cornea Michał Dembek Dragoș Dima Adrian Ungur
The following player received entry into the singles main draw as an alternate: Aldin Šetkić
The following players received entry from the qualifying draw: Nicolae Frunză Jeremy Jahn Fabrizio Ornago Jelle Sels
The following player received entry as a lucky loser: Javier Barranco Cosano
Champions
Singles
Dragoș Dima def. Jelle Sels 6–3, 6–2.
Doubles
Kevin Krawietz / Andreas Mies def. Tomasz Bednarek / David Pel 6–4, 6–2.