| Singles | |
|---|---|
| 2021 Koser Jewelers Tennis Challenge | |
| Champion |  Nuria Párrizas Díaz |
| Runner-up |  Greet Minnen |
| Score | 7–6(8–6), 4–6, 7–6(9–7) |
Madison Brengle was the defending champion, having won the previous edition in 2019, [1] but lost in the second round to Lesley Pattinama Kerkhove.
Nuria Párrizas Díaz won the title, defeating Greet Minnen in the final, 7–6(8–6), 4–6, 7–6(9–7).
Madison Brengle (second round)
Clara Tauson (second round, retired) Nuria Párrizas Díaz (champion) Greet Minnen (final) Varvara Lepchenko (withdrew) Ysaline Bonaventure (first round)
Anna Kalinskaya (first round) Caty McNally (quarterfinals)| Semifinals | Final | ||||||||||||
 Lesley Pattinama Kerkhove | 3 | 1 | |||||||||||
| 4 | Greet Minnen | 6 | 6 | ||||||||||
| 4 | Greet Minnen | 66 | 6 | 67 | |||||||||
| 3 | Nuria Párrizas Díaz | 78 | 4 | 79 | |||||||||
| 3 | Nuria Párrizas Díaz | 2 | 6 | 6 | |||||||||
 Katarzyna Kawa | 6 | 0 | 3 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Brengle | 6 | 7 | ||||||||||||||||||||||||
| WC | A Glatch | 1 | 5 | 1 | M Brengle | 3 | 64 | ||||||||||||||||||||
 L Cabrera | 2 | 3 | L Pattinama Kerkhove | 6 | 77 | ||||||||||||||||||||||
| L Pattinama Kerkhove | 6 | 6 | L Pattinama Kerkhove | 62 | 6 | 6 | |||||||||||||||||||||
| Q |  D Snigur | 0r | Q |  B Haddad Maia | 77 | 4 | 1 | ||||||||||||||||||||
| Q | B Haddad Maia | 5 | Q | B Haddad Maia | 6 | 6 | |||||||||||||||||||||
| LL | S Chang | 77 | 7 | LL | S Chang | 4 | 4 | ||||||||||||||||||||
| 7 | A Kalinskaya | 65 | 5 | L Pattinama Kerkhove | 3 | 1 | |||||||||||||||||||||
| 4 | G Minnen | 66 | 6 | 6 | 4 | G Minnen | 6 | 6 | |||||||||||||||||||
| F Di Lorenzo | 78 | 2 | 2 | 4 | G Minnen | 6 | 6 | ||||||||||||||||||||
| Q |  M Hontama | 6 | 4 | Q | M Hontama | 3 | 2 | ||||||||||||||||||||
| WC | D Lao | 2 | 1r | 4 | G Minnen | 7 | 6 | ||||||||||||||||||||
| C Dolehide | 4 | 4 | 8 | C McNally | 5 | 3 | |||||||||||||||||||||
| Q | M Hibi | 6 | 6 | Q | M Hibi | 4 | 62 | ||||||||||||||||||||
| Q |  A Sutjiadi | 5 | 4 | 8 | C McNally | 6 | 77 | ||||||||||||||||||||
| 8 | C McNally | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | Y Bonaventure | 64 | 2 | ||||||||||||||||||||||||
| Q |  E Raducanu | 77 | 6 | Q | E Raducanu | 3 | 6 | 6 | |||||||||||||||||||
| Q |  E Gorgodze | 63 | 6 | 1 | E Gorgodze | 6 | 0 | 1 | |||||||||||||||||||
| C Vandeweghe | 77 | 3 | 0r | Q | E Raducanu | 3r | |||||||||||||||||||||
| WC | G Min | 6 | 5 | 77 | 3 | N Párrizas Díaz | 4 | ||||||||||||||||||||
| PR | V Diatchenko | 3 | 7 | 64 | WC | G Min | 2 | 6 | 1 | ||||||||||||||||||
| WC | J Loeb | 62 | 2 | 3 | N Párrizas Díaz | 6 | 3 | 6 | |||||||||||||||||||
| 3 | N Párrizas Díaz | 77 | 6 | 3 | N Párrizas Díaz | 2 | 6 | 6 | |||||||||||||||||||
| Q |  A Raina | 6 | 6 | K Kawa | 6 | 0 | 3 | ||||||||||||||||||||
 R Zarazúa | 3 | 2 | Q | A Raina | 3 | 77 | 4 | ||||||||||||||||||||
| K Kawa | 3 | 6 | 7 | K Kawa | 6 | 64 | 6 | ||||||||||||||||||||
 L Küng | 6 | 1 | 5 | K Kawa | 6 | 2 | 6 | ||||||||||||||||||||
| M Fręch | 6 | 6 | M Fręch | 4 | 6 | 2 | |||||||||||||||||||||
| C Bucșa | 2 | 3 | M Fręch | 710 | 0 | ||||||||||||||||||||||
| Ar Rodionova | 1 | 2 | 2 | C Tauson | 68 | 0r | |||||||||||||||||||||
| 2 | C Tauson | 6 | 6 | ||||||||||||||||||||||||
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