2021 Sibiu Open
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The 2021 Sibiu Open was a professional tennis tournament played on clay courts. It was the tenth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Sibiu, Romania between 27 September and 3 October 2021.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| ITA | Stefano Travaglia | 98 | 1 |
| MDA | Radu Albot | 104 | 2 |
| SVK | Alex Molčan | 118 | 3 |
| BIH | Damir Džumhur | 129 | 4 |
| CZE | Zdeněk Kolář | 149 | 5 |
| SUI | Marc-Andrea Hüsler | 159 | 6 |
| AUS | Thanasi Kokkinakis | 183 | 7 |
| IND | Sumit Nagal | 185 | 8 |
- 1 Rankings are as of 20 September 2021.
Other entrants
The following players received wildcards into the singles main draw:
- Romania Victor Vlad Cornea
- Romania Vlad Andrei Dancu
- Greece Petros Tsitsipas
The following players received entry from the qualifying draw:
- Russia Yan Bondarevskiy
- Romania David Ionel
- Israel Yshai Oliel
- Romania Ștefan Paloși
The following player received entry as a lucky loser:
- Germany Elmar Ejupovic
Champions
Singles
- Italy Stefano Travaglia def. Australia Thanasi Kokkinakis 7–6(7–4), 6–2.
Doubles
- Austria Alexander Erler / Austria Lucas Miedler def. United States James Cerretani / Switzerland Luca Margaroli 6–3, 6–1.