| 2021 Winners Open | |
|---|---|
| Date | 2–8 August |
| Edition | 1st |
| Category | WTA 250 |
| Draw | 32S / 16D |
| Prize money | $235,000 |
| Surface | Clay |
| Location | Cluj-Napoca, Romania |
| Venue | Winners Sports Club |
| Champions | |
| Singles | |
 Andrea Petkovic | |
| Doubles | |
 Natela Dzalamidze /  Kaja Juvan | |
The 2021 WTA Romanian Open, known as the Winners Open due to sponsorship reasons, was a professional women's tennis tournament played on outdoor clay courts at the Winners Sports Club. It was the 1st edition of the tournament held in the city of Cluj-Napoca and was a part of the 2021 WTA Tour.[1][2]
Andrea Petkovic def. 
Mayar Sherif, 6–1, 6–1.This was Petkovic's seventh WTA Tour singles title, and first since 2015.
Natela Dzalamidze / Kaja Juvan def. 
Katarzyna Piter / Mayar Sherif, 6–3, 6–4.This was the maiden WTA Tour title won by both Dzalamidze and Juvan.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 FRA
|
Alizé Cornet | 63 | 1 |
| GER
|
Andrea Petkovic | 97 | 2 |
 ROU
|
Ana Bogdan | 101 | 3 |
 ITA
|
Martina Trevisan | 102 | 4 |
| ROU
|
Elena-Gabriela Ruse | 105 | 5 |
| SLO
|
Kaja Juvan | 114 | 6 |
 BUL
|
Viktoriya Tomova | 119 | 7 |
 SVK
|
Kristína Kučová | 120 | 8 |
The following players received wildcards into the main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
Tímea Babos → replaced by Katarzyna Kawa Irina-Camelia Begu → replaced by Viktória Kužmová Elisabetta Cocciaretto → replaced by Mihaela Buzărnescu
Zarina Diyas → replaced by Jaqueline Cristian Sara Errani → replaced by Kristína Kučová
Viktorija Golubic → replaced by Mayar Sherif Polona Hercog → replaced by Anna Karolína Schmiedlová
Tereza Martincová → replaced by 
Lesia Tsurenko Jasmine Paolini → replaced by Réka Luca Jani
Arantxa Rus → replaced by 
Çağla Büyükakçay Patricia Maria Țig → replaced by 
Lara Arruabarrena| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| SVK
|
Viktória Kužmová | POL
|
Alicja Rosolska | 140 | 1 |
 SRB
|
Aleksandra Krunić |  BLR
|
Lidziya Marozava | 150 | 2 |
| ESP
|
Lara Arruabarrena | ROU
|
Andreea Mitu | 186 | 3 |
 GEO
|
Oksana Kalashnikova | SVK
|
Tereza Mihalíková | 233 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry using a protected ranking:
Irina-Camelia Begu / Andreea Mitu → replaced by Lara Arruabarrena / Andreea Mitu Anna Bondár / Fanny Stollár → replaced by Katarzyna Piter / Mayar Sherif Anna Danilina / 
Ulrikke Eikeri → replaced by Anna Bondár / Ulrikke Eikeri Viktória Kužmová / Arantxa Rus → replaced by Alena Fomina / Ekaterina Yashina Vivian Heisen / Alicja Rosolska → replaced by Viktória Kužmová / Alicja Rosolska Ekaterine Gorgodze / Paula Kania-Choduń → replaced by Oana Georgeta Simion / Gabriela Talabă
