The 2020 Sibiu Open was a professional tennis tournament played on clay courts. It was the ninth edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Sibiu, Romania between 21 and 27 September 2020.
Singles main-draw entrants
Seeds
1 Rankings are as of 14 September 2020.
Other entrants
The following players received wildcards into the singles main draw: Victor Vlad Cornea Dragoș Dima Nicholas David Ionel
The following player received entry into the singles main draw using a protected ranking: Íñigo Cervantes
The following player received entry into the singles main draw as an alternate: Felipe Meligeni Alves
The following players received entry from the qualifying draw: Elmar Ejupovic Carlos Gómez-Herrera Ergi Kırkın Matthieu Perchicot
Champions
Singles
Marc-Andrea Hüsler def. Tomás Martín Etcheverry 7–5, 6–0.
Doubles
Hunter Reese / Jan Zieliński def. Robert Galloway / Hans Hach Verdugo 6–4, 6–2.