# 2021 Internationaux de Strasbourg – Singles

Elina Svitolina was the defending champion but chose not to participate.
Barbora Krejčíková won her maiden WTA singles title, defeating Sorana Cîrstea in the final, 6–3, 6–3.

## Seeds

* Bianca Andreescu (quarterfinals, withdrew)
* Jessica Pegula (first round)
* Ekaterina Alexandrova (quarterfinals)
* Yulia Putintseva (quarterfinals)
* Barbora Krejčíková (champion)
* Zhang Shuai (second round)
* Shelby Rogers (second round)
* Magda Linette (semifinals)

## 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 |
| | Sorana Cîrstea | 3 | 6 | 6 | | | | |
| 8 | Magda Linette | 6 | 4 | 2 | | | | |
| 8 | Magda Linette | 6 | 4 | 2 | | Sorana Cîrstea | 3 | 3 |
| | | | | | 5 | Barbora Krejčíková | 6 | 6 |
| 5 | Barbora Krejčíková | 5 | 6 | 6 | 5 | Barbora Krejčíková | 6 | 6 |
| Q | Jule Niemeier | 7 | 3 | 4 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | B Andreescu | 6 | 6 | | | | | | | | | | | | | | |
| Q | A Lázaro García | 1 | 2 | | 1 | B Andreescu | 6 | 6 | | | | | | | | | |
| Q | M Zanevska | 6 | 6 | | Q | M Zanevska | 1 | 4 | | | | | | | | | |
| Q | Y Hatouka | 2 | 1 | | | | | | 1 | B Andreescu | | | | | | | |
| | V Williams | 1 | 6 | 1 | | | | | | S Cîrstea | w/o | | | | | | |
| | S Cîrstea | 6 | 2 | 6 | | S Cîrstea | 6 | 6 | | | | | | | | | |
| | M Doi | 5 | 4 | | 6 | S Zhang | 2 | 1 | | | | | | | | | |
| 6 | S Zhang | 7 | 6 | | | | | | | | | | | S Cîrstea | 3 | 6 | 6 |
| 4 | Y Putintseva | 6 | 3 | 7$^7$ | | | | | | | | | 8 | M Linette | 6 | 4 | 2 |
| | R Peterson | 4 | 6 | 6$^2$ | 4 | Y Putintseva | 2 | | | | | | | | | | |
| | A Blinkova | 2 | 3 | | | J Teichmann | 0$^r$ | | | | | | | | | | |
| | J Teichmann | 6 | 6 | | | | | | 4 | Y Putintseva | 3 | 3 | | | | | |
| | Kr Plíšková | 4 | 5 | | | | | | 8 | M Linette | 6 | 6 | | | | | |
| | A Cornet | 6 | 7 | | | A Cornet | 6$^2$ | 0$^r$ | | | | | | | | | |
| | N Hibino | 2 | 0 | | 8 | M Linette | 7$^7$ | 3 | | | | | | | | | |
| 8 | M Linette | 6 | 6 | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | B Krejčíková | 6 | 3 | | | | | | | | | | | | | | | |
| Q | O Dodin | 3 | 0$^r$ | | 5 | B Krejčíková | 3 | 6 | 6 | | | | | | | | | |
| | C Garcia | 7 | 6 | | | C Garcia | 6 | 2 | 1 | | | | | | | | | |
| | Z Diyas | 5 | 2 | | | | | | | 5 | B Krejčíková | 7$^7$ | 6 | | | | | |
| | V Gracheva | 3 | 1 | | | | | | | 3 | E Alexandrova | 6$^4$ | 1 | | | | | |
| WC | C Burel | 6 | 6 | | WC | C Burel | 3 | 4 | | | | | | | | | | |
| | L Davis | 1 | 5 | | 3 | E Alexandrova | 6 | 6 | | | | | | | | | | |
| 3 | E Alexandrova | 6 | 7 | | | | | | | | | | | 5 | B Krejčíková | 5 | 6 | 6 |
| 7 | S Rogers | 7 | 6$^6$ | 7 | | | | | | | | | | Q | J Niemeier | 7 | 3 | 4 |
| | C McHale | 5 | 7$^8$ | 5 | 7 | S Rogers | 4 | 6$^6$ | | | | | | | | | | |
| Q | J Niemeier | 6 | 6 | | Q | J Niemeier | 6 | 7$^8$ | | | | | | | | | | |
| Q | D Parry | 4 | 3 | | | | | | | Q | J Niemeier | 6 | 6 | | | | | |
| | A Van Uytvanck | 4 | 4 | | | | | | | | A Rus | 4 | 1 | | | | | |
| WC | H Tan | 6 | 6 | | WC | H Tan | 1 | 1$^r$ | | | | | | | | | | |
| | A Rus | 6 | 6 | | | A Rus | 6 | 1 | | | | | | | | | | |
| 2 | J Pegula | 4 | 4 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Varvara Gracheva (moved to main draw)
* Zarina Diyas (moved to main draw)
* Christina McHale (moved to main draw)
* Andrea Petkovic (qualifying competition)
* Océane Dodin (qualified)
* Chloé Paquet (first round)
* Jule Niemeier (qualified)
* Simona Waltert (qualifying competition)
* Ulrikke Eikeri (first round)
* Jessica Pieri (first round)
* Zheng Qinwen (first round)
* Maryna Zanevska (qualified)

### Qualifiers

* Yuliya Hatouka
* Maryna Zanevska
* Diane Parry
* Jule Niemeier
* Océane Dodin
* Andrea Lázaro García

### Draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | | | Yuliya Hatouka | 6 | 7 |
| | | | | | WC | Evita Ramirez | 3 | 5 |
| WC | Evita Ramirez | 3 | 6 | 7$^7$ | WC | Evita Ramirez | 3 | 5 |
| 10 | Jessica Pieri | 6 | 4 | 6$^4$ | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| Alt | Angelina Gabueva | 5 | 2 | | | | | |
| | Despina Papamichail | 7 | 6 | | | | | |
| | Despina Papamichail | 7 | 6 | | Despina Papamichail | 6 | 2 | 5 |
| | | | | 12 | Maryna Zanevska | 4 | 6 | 7 |
| WC | Elsa Jacquemot | 5 | 6$^3$ | 12 | Maryna Zanevska | 4 | 6 | 7 |
| 12 | Maryna Zanevska | 7 | 7$^7$ | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | | | Diane Parry | 2 | 6 | 6 |
| | | | | | PR | Karman Thandi | 6 | 4 | 2 |
| PR | Karman Thandi | 6 | 4 | 7$^7$ | PR | Karman Thandi | 6 | 4 | 2 |
| 11 | Zheng Qinwen | 3 | 6 | 6$^1$ | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Andrea Petkovic | 7 | 6$^3$ | 6 | | | | | |
| WC | Estelle Cascino | 5 | 7$^7$ | 2 | | | | | |
| WC | Estelle Cascino | 5 | 7$^7$ | 2 | 4 | Andrea Petkovic | 3 | 7$^7$ | 3 |
| | | | | | 7 | Jule Niemeier | 6 | 6$^4$ | 6 |
| | Bianca Turati | 0 | 4 | | 7 | Jule Niemeier | 6 | 6$^4$ | 6 |
| 7 | Jule Niemeier | 6 | 6 | | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Océane Dodin | 6 | 6 | | | | |
| PR | Naiktha Bains | 4 | 0 | | | | |
| PR | Naiktha Bains | 4 | 0 | 5 | Océane Dodin | 6 | 7 |
| | | | | 8 | Simona Waltert | 4 | 5 |
| | Paula Ormaechea | 3 | 3 | 8 | Simona Waltert | 4 | 5 |
| 8 | Simona Waltert | 6 | 6 | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Chloé Paquet | 4 | 7 | 3 | | | | | |
| WC | Jessika Ponchet | 6 | 5 | 6 | | | | | |
| WC | Jessika Ponchet | 6 | 5 | 6 | WC | Jessika Ponchet | 6$^4$ | 6 | 3 |
| | | | | | | Andrea Lázaro García | 7$^7$ | 1 | 6 |
| | Andrea Lázaro García | 6 | 6 | | | Andrea Lázaro García | 7$^7$ | 1 | 6 |
| 9 | Ulrikke Eikeri | 4 | 3 | | | | | | |