| Singles | |
|---|---|
| 2021 Zagreb Ladies Open | |
| Champion |  Anhelina Kalinina |
| Runner-up |  Kamilla Rakhimova |
| Final score | 6–1, 6–3 |
Ana Konjuh was the defending champion [1] but chose to compete in Madrid instead.
Anhelina Kalinina won the title, defeating Kamilla Rakhimova in the final, 6–1, 6–3.
Elisabetta Cocciaretto (Second round)
Greet Minnen (First round)
Katarzyna Kawa (First round) Kamilla Rakhimova (Final)
Kristína Kučová (Quarterfinals)
Kurumi Nara (First round)
Barbara Haas (Quarterfinals)
Olga Danilović (Withdrew)| Semifinals | Final | ||||||||||||
| PR |  Alexandra Dulgheru | 4 | 5 | ||||||||||
| 4 | Kamilla Rakhimova | 6 | 7 | ||||||||||
| 4 | Kamilla Rakhimova | 1 | 3 | ||||||||||
| Anhelina Kalinina | 6 | 6 | |||||||||||
| Anhelina Kalinina | 6 | 6 | |||||||||||
| Q | Jessica Pieri | 2 | 0 | ||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | E Cocciaretto | 4 | 6 | 710 | |||||||||||||||||||||||
| R Šramková | 6 | 3 | 68 | 1 | E Cocciaretto | 4 | 1 | ||||||||||||||||||||
| PR | A Dulgheru | 6 | 6 | PR | A Dulgheru | 6 | 6 | ||||||||||||||||||||
| LL | F Arcidiacono | 0 | 1 | PR | A Dulgheru | 1 | 6 | 6 | |||||||||||||||||||
| PR | I Khromacheva | 4 | 6 | 4 | 5 | K Kučová | 6 | 2 | 1 | ||||||||||||||||||
| A Gasanova | 6 | 4 | 6 | A Gasanova | 5 | 2 | |||||||||||||||||||||
| WC | M Đaković | 1 | 4 | 5 | K Kučová | 7 | 6 | ||||||||||||||||||||
| 5 | K Kučová | 6 | 6 | PR | A Dulgheru | 4 | 5 | ||||||||||||||||||||
| 4 | K Rakhimova | 6 | 4 | 6 | 4 | K Rakhimova | 6 | 7 | |||||||||||||||||||
 L Pattinama Kerkhove | 1 | 6 | 0 | 4 | K Rakhimova | 6 | 2 | 7 | |||||||||||||||||||
| Q |  T Mrdeža | 2 | 6 | 6 | Q | T Mrdeža | 4 | 6 | 5 | ||||||||||||||||||
| Q | A Prisăcariu | 6 | 3 | 3 | 4 | K Rakhimova | 6 | 4 | 6 | ||||||||||||||||||
| WC | J Fett | 6 | 6 | WC | J Fett | 3 | 6 | 4 | |||||||||||||||||||
| WC | L Bošković | 2 | 1 | WC | J Fett | 6 | 6 | ||||||||||||||||||||
| Q |  RL Jani | 6 | 6 | Q | RL Jani | 4 | 3 | ||||||||||||||||||||
| LL | M Benoît | 1 | 2 | ||||||||||||||||||||||||
| First Round | Second Round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | K Nara | 4 | 3 | ||||||||||||||||||||||||
| WC | P Marčinko | 6 | 6 | WC | P Marčinko | 1 | 2 | ||||||||||||||||||||
| Q |  J Niemeier | 6 | 79 | Q | J Niemeier | 6 | 6 | ||||||||||||||||||||
| Q |  D Jakupović | 4 | 67 | Q | J Niemeier | 5 | 4 | ||||||||||||||||||||
| A Kalinina | 6 | 65 | 6 | A Kalinina | 7 | 6 | |||||||||||||||||||||
 M Bolkvadze | 3 | 77 | 2 | A Kalinina | 60 | 6 | 6 | ||||||||||||||||||||
| JE |  D Parry | 6 | 5 | 6 | JE | D Parry | 77 | 3 | 2 | ||||||||||||||||||
| 3 | K Kawa | 4 | 7 | 4 | A Kalinina | 6 | 6 | ||||||||||||||||||||
| 7 | B Haas | 65 | 6 | 6 | Q | J Pieri | 2 | 0 | |||||||||||||||||||
 C Bucșa | 77 | 1 | 2 | 7 | B Haas | 6 | 6 | ||||||||||||||||||||
| Q | T Würth | 6 | 4 | 77 | Q | T Würth | 3 | 4 | |||||||||||||||||||
| Q |  R Marino | 4 | 6 | 64 | 7 | B Haas | 2 | 7 | 1 | ||||||||||||||||||
| Q | J Pieri | 2 | 6 | 6 | Q | J Pieri | 6 | 5 | 6 | ||||||||||||||||||
| M Di Giuseppe | 6 | 2 | 2 | Q | J Pieri | 4 | 77 | 6 | |||||||||||||||||||
| E-G Ruse | 6 | 6 | E-G Ruse | 6 | 65 | 3 | |||||||||||||||||||||
| 2 | G Minnen | 3 | 1 | ||||||||||||||||||||||||
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