| Singles | |
|---|---|
| 2021 Berkeley Tennis Club Challenge | |
| Champion |  Usue Maitane Arconada |
| Runner-up |  Marcela Zacarías |
| Score | 6–1, 6–3 |
Madison Brengle was the defending champion [1] but chose to compete at the 2021 Chicago Fall Tennis Classic instead.
Usue Maitane Arconada won the title, defeating Marcela Zacarías in the final, 6–1, 6–3.
Zheng Saisai (first round) Wang Xinyu (first round)
Panna Udvardy (first round)
Kurumi Nara (semifinals, retired) Katie Volynets (first round) Francesca Di Lorenzo (first round) Mayo Hibi (semifinals)
Liang En-shuo (quarterfinals)| Semifinals | Final | ||||||||||||
| Marcela Zacarías | 5 | 3 | |||||||||||
| 4 | Kurumi Nara | 7 | 0r | ||||||||||
| Marcela Zacarías | 1 | 3 | |||||||||||
| Usue Maitane Arconada | 6 | 6 | |||||||||||
| 7 | Mayo Hibi | 3 | 77 | 4 | |||||||||
| Usue Maitane Arconada | 6 | 63 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | S Zheng | 6 | 5 | 1 | |||||||||||||||||||||||
| Q |  M Kozyreva | 4 | 7 | 6 | Q | M Kozyreva | 5 | 3 | |||||||||||||||||||
| K Okamura | 5 | 2 | Q | E Navarro | 7 | 6 | |||||||||||||||||||||
| Q | E Navarro | 7 | 6 | Q | E Navarro | 5 | 7 | 2 | |||||||||||||||||||
| WC | R Brantmeier | 6 | 2 | 6 | M Zacarías | 7 | 5 | 6 | |||||||||||||||||||
| Q |  A Bozovic | 3 | 6 | 4 | WC | R Brantmeier | 7 | 2 | 1 | ||||||||||||||||||
| M Zacarías | 77 | 3 | 6 | M Zacarías | 5 | 6 | 6 | ||||||||||||||||||||
| 5 | K Volynets | 65 | 6 | 2 | M Zacarías | 5 | 3 | ||||||||||||||||||||
| 4 | K Nara | 77 | 7 | 4 | K Nara | 7 | 0r | ||||||||||||||||||||
| Q | H Kuwata | 61 | 5 | 4 | K Nara | 6 | 6 | ||||||||||||||||||||
| Q | M Manasse | 63 | 2 | WC | E Douglas | 3 | 2 | ||||||||||||||||||||
| WC | E Douglas | 77 | 6 | 4 | K Nara | 77 | 5 | 6 | |||||||||||||||||||
| D Lao | 2 | 0r | Q | S Chang | 65 | 7 | 4 | ||||||||||||||||||||
| Q | S Chang | 6 | 1 | Q | S Chang | 6 | 6 | ||||||||||||||||||||
 D Jakupović | 6 | 6 | D Jakupović | 1 | 2 | ||||||||||||||||||||||
| 6 | F Di Lorenzo | 3 | 2 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | M Hibi | 6 | 6 | ||||||||||||||||||||||||
| Q | J Hart | 3 | 2 | 7 | M Hibi | 6 | 77 | ||||||||||||||||||||
| WC | V Duval | 6 | 6 | WC | V Duval | 0 | 63 | ||||||||||||||||||||
| Q | H Kaji | 2 | 1 | 7 | M Hibi | 6 | 6 | ||||||||||||||||||||
| WC |  P Expósito Díaz Delgado | 2 | 6 | 1 | PR | L Chirico | 2 | 3 | |||||||||||||||||||
| SE | K Day | 6 | 3 | 6 | SE | K Day | 0r | ||||||||||||||||||||
| PR | L Chirico | 6 | 4 | 6 | PR | L Chirico | 2 | ||||||||||||||||||||
| 3 | P Udvardy | 4 | 6 | 4 | 7 | M Hibi | 3 | 77 | 4 | ||||||||||||||||||
| 8 | E-s Liang | 6 | 7 | UM Arconada | 6 | 63 | 6 | ||||||||||||||||||||
| Jia Lu | 4 | 5 | 8 | E-s Liang | 6 | 6 | |||||||||||||||||||||
| H Chang | 6 | 4 | 6 | H Chang | 2 | 1 | |||||||||||||||||||||
 M Björklund | 3 | 6 | 1 | 8 | E-s Liang | 3 | 1 | ||||||||||||||||||||
 K Sebov | 67 | 4 | UM Arconada | 6 | 6 | ||||||||||||||||||||||
| UM Arconada | 79 | 6 | UM Arconada | 6 | 65 | 6 | |||||||||||||||||||||
| S Vickery | 7 | 77 | S Vickery | 4 | 77 | 2 | |||||||||||||||||||||
| 2 | Xin Wang | 5 | 65 | ||||||||||||||||||||||||
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