# 2021 Bol Open – Singles

Tamara Zidanšek was the two-time defending champion, having won the last edition in 2019, however she was unable to defend her title as she was still competing at the 2021 French Open, reaching the semi-final of the Grand Slam.
Jasmine Paolini won the title, defeating Arantxa Rus in the final, 6–2, 7–6$^{(7–4)}$.

## Seeds

* Anna Blinkova (semifinals)
* Arantxa Rus (final)
* Jasmine Paolini (champion)
* Martina Trevisan (quarterfinals)
* Sara Errani (second round)
* Liudmila Samsonova (second round)
* Aliona Bolsova (first round)
* Tímea Babos (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Anna Blinkova | 2 | 2 | | | | |
| 3 | Jasmine Paolini | 6 | 6 | | | | |
| 3 | Jasmine Paolini | 6 | 6 | 3 | Jasmine Paolini | 6 | 7$^7$ |
| | | | | 2 | Arantxa Rus | 2 | 6$^4$ |
| | Irina Bara | 2 | 1 | 2 | Arantxa Rus | 2 | 6$^4$ |
| 2 | Arantxa Rus | 6 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Blinkova | 3 | 6 | 6 | | | | | | | | | | | | | | |
| PR | P Hon | 6 | 0 | 1 | 1 | A Blinkova | 6 | 6 | | | | | | | | | | |
| | UM Arconada | 7$^7$ | 3 | 2 | Q | A Cadanțu | 2 | 1 | | | | | | | | | | |
| Q | A Cadanțu | 6$^1$ | 6 | 6 | | | | | | 1 | A Blinkova | 6 | 4 | 7 | | | | |
| PR | A Dulgheru | 4 | 4 | | | | | | | | B Haas | 4 | 6 | 5 | | | | |
| | B Haas | 6 | 6 | | | B Haas | 6 | 6 | | | | | | | | | | |
| WC | A Konjuh | 6 | 6$^3$ | 4 | 6 | L Samsonova | 3 | 4 | | | | | | | | | | |
| 6 | L Samsonova | 1 | 7$^7$ | 6 | | | | | | | | | | | 1 | A Blinkova | 2 | 2 |
| 3 | J Paolini | 6 | 6 | | | | | | | | | | | | 3 | J Paolini | 6 | 6 |
| | V Kužmová | 4 | 1 | | 3 | J Paolini | 6 | 4 | 6 | | | | | | | | | |
| Q | L Sun | 3 | 6$^7$ | | | O Govortsova | 1 | 6 | 3 | | | | | | | | | |
| | O Govortsova | 6 | 7$^9$ | | | | | | | 3 | J Paolini | 6 | 6 | | | | | |
| | N Párrizas Díaz | 6 | 5 | 3 | | | | | | | K Kučová | 1 | 1 | | | | | |
| | K Kučová | 4 | 7 | 6 | | K Kučová | 3 | 6 | 6 | | | | | | | | | |
| WC | T Mrdeža | 6 | 6 | | WC | T Mrdeža | 6 | 4 | 3 | | | | | | | | | |
| 8 | T Babos | 1 | 2 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | A Bolsova | 4 | 2 | | | | | | | | | | | | | | | |
| WC | T Lukas | 6 | 6 | | WC | T Lukas | 3 | 0 | | | | | | | | | | |
| | K Kawa | 4 | 6 | 5 | | I Bara | 6 | 6 | | | | | | | | | | |
| | I Bara | 6 | 4 | 7 | | | | | | | I Bara | 2 | 7 | 6 | | | | |
| | G Minnen | 2 | 1$^r$ | | | | | | | 4 | M Trevisan | 6 | 5 | 0 | | | | |
| | AK Schmiedlová | 6 | 3 | | | AK Schmiedlová | 4 | 1 | | | | | | | | | | |
| | R Zarazúa | 2 | 0 | | 4 | M Trevisan | 6 | 6 | | | | | | | | | | |
| 4 | M Trevisan | 6 | 6 | | | | | | | | | | | | | I Bara | 2 | 1 |
| 5 | S Errani | 6 | 6 | | | | | | | | | | | | 2 | A Rus | 6 | 6 |
| WC | J Fett | 3 | 3 | | 5 | S Errani | 7$^7$ | 5 | 6$^1$ | | | | | | | | | |
| Q | E Gorgodze | 6 | 3 | 4 | | C Liu | 6$^3$ | 7 | 7$^7$ | | | | | | | | | |
| | C Liu | 4 | 6 | 6 | | | | | | | C Liu | 6 | 5 | 4 | | | | |
| Q | D Gálfi | 2 | 3 | | | | | | | 2 | A Rus | 1 | 7 | 6 | | | | |
| | K Zavatska | 6 | 6 | | | K Zavatska | 1 | 0$^r$ | | | | | | | | | | |
| | Y Bonaventure | 3 | 3 | | 2 | A Rus | 6 | 2 | | | | | | | | | | |
| 2 | A Rus | 6 | 6 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Lara Arruabarrena (qualifying competition)
* Asia Muhammad (qualifying competition)
* Whitney Osuigwe (qualifying competition)
* Ekaterine Gorgodze (qualified)

### Qualifiers

* Alexandra Cadanțu
* Dalma Gálfi
* Lulu Sun
* Ekaterine Gorgodze

### Draw
#### First qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Lara Arruabarrena | 0 | 5 | |
| | Alexandra Cadanțu | 6 | 7 | |

#### Second qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Asia Muhammad | 6 | 1 | 2 |
| | Dalma Gálfi | 3 | 6 | 6 |

#### Third qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Whitney Osuigwe | 6 | 2 | 4 |
| WC | Lulu Sun | 3 | 6 | 6 |

#### Fourth qualifier

| Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Ekaterine Gorgodze | 6 | 6 | |
| WC | Ayline Samardžić | 0 | 0 | |