# 2021 Chicago Women's Open – Singles

This was the first edition of the tournament.
Elina Svitolina won the title, defeating Alizé Cornet in the final, 7–5, 6–4.

## Seeds

* Elina Svitolina (champion)
* Camila Giorgi (withdrew)
* Sorana Cîrstea (first round)
* Tamara Zidanšek (first round)
* Markéta Vondroušová (quarterfinals)
* Viktorija Golubic (second round)
* Kristina Mladenovic (quarterfinals)
* Marta Kostyuk (quarterfinals)
* Alizé Cornet (final)

## 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 | Semifinals | Final | Final | Final | Final |
| 1/WC | Elina Svitolina | 6 | 6$^4$ | 6 | | | | |
| | Rebecca Peterson | 1 | 7$^7$ | 3 | | | | |
| | Rebecca Peterson | 1 | 7$^7$ | 3 | 1/WC | Elina Svitolina | 7 | 6 |
| | | | | | 9 | Alizé Cornet | 5 | 4 |
| | Varvara Gracheva | 6 | 1 | 0 | 9 | Alizé Cornet | 5 | 4 |
| 9 | Alizé Cornet | 4 | 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 | Semifinals |
| 1/WC | E Svitolina | 5 | 6 | 2 | | | | | | | | | | | | | | | |
| LL | C Burel | 7 | 1 | 0$^r$ | 1/WC | E Svitolina | 6 | 6 | | | | | | | | | | | |
| | F Ferro | 4 | 7 | 6 | | F Ferro | 4 | 4 | | | | | | | | | | | |
| Q | A Sutjiadi | 6 | 5 | 1 | | | | | | 1/WC | E Svitolina | 6 | 6 | | | | | | |
| | D Kovinić | 4 | 2 | | | | | | | 7 | K Mladenovic | 1 | 0 | | | | | | |
| WC | F Abanda | 6 | 6 | | WC | F Abanda | 3 | 2 | | | | | | | | | | | |
| Q | Z Diyas | 2 | 6$^3$ | | 7 | K Mladenovic | 6 | 6 | | | | | | | | | | | |
| 7 | K Mladenovic | 6 | 7$^7$ | | | | | | | | | | | | 1/WC | E Svitolina | 6 | 6$^4$ | 6 |
| 3 | S Cîrstea | 6 | 3 | 2 | | | | | | | | | | | | R Peterson | 1 | 7$^7$ | 3 |
| | T Martincová | 3 | 6 | 6 | | T Martincová | 3 | 6 | 6 | | | | | | | | | | |
| WC | V Williams | 2 | 3 | | | S-w Hsieh | 6 | 4 | 2 | | | | | | | | | | |
| | S-w Hsieh | 6 | 6 | | | | | | | | T Martincová | 7$^7$ | 2 | 1$^r$ | | | | | |
| | R Peterson | 7$^{11}$ | 7$^8$ | | | | | | | | R Peterson | 6$^4$ | 6 | 4 | | | | | |
| | M Bouzková | 6$^9$ | 6$^6$ | | | R Peterson | 7$^7$ | 6 | | | | | | | | | | | |
| | C Osorio | 6$^5$ | 3 | | 6 | V Golubic | 6$^5$ | 3 | | | | | | | | | | | |
| 6 | V Golubic | 7$^7$ | 6 | | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | M Kostyuk | 6 | 6 | | | | | | | | | | | | | | | |
| WC | K Sebov | 0 | 3 | | 8 | M Kostyuk | 6 | 6 | | | | | | | | | | |
| | K Kanepi | 3 | 6 | 7 | | K Kanepi | 2 | 3 | | | | | | | | | | |
| | A Kalinina | 6 | 2 | 5 | | | | | 8 | M Kostyuk | 7$^7$ | 3 | 4 | | | | | |
| Q | A Bogdan | 6 | 1 | | | | | | | V Gracheva | 6$^4$ | 6 | 6 | | | | | |
| | H Watson | 2 | 0$^r$ | | Q | A Bogdan | 5 | 1$^r$ | | | | | | | | | | |
| | V Gracheva | 6 | 1 | 6 | | V Gracheva | 7 | 3 | | | | | | | | | | |
| 4 | T Zidanšek | 3 | 6 | 2 | | | | | | | | | | | V Gracheva | 6 | 1 | 0 |
| 5 | M Vondroušová | 6 | 6 | | | | | | | | | | | 9 | A Cornet | 4 | 6 | 6 |
| Q | Q Gleason | 2 | 0 | | 5 | M Vondroušová | 6 | 1 | | | | | | | | | | |
| | N Hibino | 1 | 3 | | | A Van Uytvanck | 1 | 0$^r$ | | | | | | | | | | |
| | A Van Uytvanck | 6 | 6 | | | | | | 5 | M Vondroušová | 6 | 4 | 3 | | | | | |
| | M Doi | 4 | 2 | | | | | | 9 | A Cornet | 2 | 6 | 6 | | | | | |
| | J Paolini | 6 | 6 | | | J Paolini | 6$^4$ | 4 | | | | | | | | | | |
| | A Li | 7$^{10}$ | 0 | 4 | 9 | A Cornet | 7$^7$ | 6 | | | | | | | | | | |
| 9 | A Cornet | 6$^8$ | 6 | 6 | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Anastasia Potapova (first round)
* Clara Burel (qualifying competition, lucky loser)
* Ana Bogdan (qualified)
* Zarina Diyas (qualified)
* Sara Errani (withdrew)
* Hailey Baptiste (first round)
* Samantha Stosur (withdrew, still playing in Cincinnati)
* Han Na-lae (qualifying competition)

### Qualifiers

* Quinn Gleason
* Aldila Sutjiadi
* Ana Bogdan
* Zarina Diyas

### Lucky loser

* Clara Burel

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Anastasia Potapova | 1 | 6 | 3 | | | | |
| | Quinn Gleason | 6 | 2 | 6 | | | | |
| | Quinn Gleason | 6 | 2 | 6 | | Quinn Gleason | 6 | 6 |
| | | | | | Alt | Makoto Ninomiya | 3 | 1 |
| WC | Maya Battle | 0 | 0 | | Alt | Makoto Ninomiya | 3 | 1 |
| Alt | Makoto Ninomiya | 6 | 6 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Clara Burel | 6 | 4 | 7 | | | | | |
| | Bárbara Gatica | 2 | 6 | 5 | | | | | |
| | Bárbara Gatica | 2 | 6 | 5 | 2 | Clara Burel | 6 | 5 | 2 |
| | | | | | | Aldila Sutjiadi | 2 | 7 | 6 |
| | Aldila Sutjiadi | 4 | 6 | 7 | | Aldila Sutjiadi | 2 | 7 | 6 |
| Alt | Lyudmyla Kichenok | 6 | 4 | 5 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Ana Bogdan | 6 | 5 | 6 | | | | |
| WC | Emma Navarro | 2 | 7 | 3 | | | | |
| WC | Emma Navarro | 2 | 7 | 3 | 3 | Ana Bogdan | 6 | 6 |
| | | | | | | Kimberley Zimmermann | 1 | 2 |
| | Kimberley Zimmermann | 6 | 6 | | | Kimberley Zimmermann | 1 | 2 |
| 6 | Hailey Baptiste | 2 | 4 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Zarina Diyas | 6 | 6 | | | | | |
| | Eden Silva | 0 | 1 | | | | | |
| | Eden Silva | 0 | 1 | 4 | Zarina Diyas | 5 | 6 | 6 |
| | | | | 8 | Han Na-lae | 7 | 1 | 1 |
| | Sophia Whittle | 1 | 1 | 8 | Han Na-lae | 7 | 1 | 1 |
| 8 | Han Na-lae | 6 | 6 | | | | | |