| 01-Aug-1921 | Angmering-on-Sea | Grass | F | Elizabeth Ryan [USA] | d. | Phyllis Satterthwaite [GBR] | 6-2 6-1 | |
| 01-Aug-1921 | Belmar | None | F | Clare Cassel [USA] | d. | Madeline Westervelt [USA] | 4-6 6-2 6-3 | |
| 01-Aug-1921 | Bournemouth | Grass | F | Kathleen Lidderdale [GBR] | d. | Doris Craddock [GBR] | 6-3 6-2 | |
| 01-Aug-1921 | Bray | None | F | Hilda Wallis [IRL] | d. | Mrs F W Price [IRL] | 6-4 6-8 8-6 | |
| 01-Aug-1921 | Framlingham | Grass | F | Dorothy Holman [GBR] | d. | Ethel Tanner [GBR] | 5-7 6-3 6-2 | |
| 01-Aug-1921 | Glen Cove | Grass | F | Molla Mallory [NOR] | d. | Marion Jessup [USA] | 6-1 7-5 | |
| 01-Aug-1921 | Hassocks | Grass | F | Sylvia Lumley Ellis [GBR] | d. | Christina Douglass [GBR] | 2-6 6-2 7-5 | |
| 01-Aug-1921 | Moffat | None | F | Mary Welsh [GBR] | d. | M E Morton [GBR] | 6-2 6-3 | |
| 01-Aug-1921 | Muskegon | None | F | Ruth Riese [USA] | d. | Mildred Lowe [USA] | 6-2 6-4 | |
| 01-Aug-1921 | Ostend | Clay | F | Helena Aitchison [GBR] | d. | Anne De Borman [BEL] | 7-5 6-0 | |
| 01-Aug-1921 | Sandown | Grass | F | Kitty Godfree [GBR] | d. | Cecily Marriott [GBR] | 6-1 6-3 | |
| 01-Aug-1921 | Spilsby | Grass | F | Ruby Mercer [AUS] | d. | M C Snaith [GBR] | 6-3 2-6 7-5 | |
| 01-Aug-1921 | Tacoma | None | F | Mayme Macdonald [USA] | d. | Lorna Fraser [CAN] | 6-1 6-0 | |
| 05-Aug-1921 | Karlsbad | Clay | F | Margarete Janotta [CZE] | d. | Elly Ledig [GER] | 6-4 6-4 | |
| 06-Aug-1921 | Niagara-on-the-Lake | None | F | Florence Best [CAN] | d. | Evelyn Macdonald [CAN] | 6-2 6-3 | |
| 07-Aug-1921 | Cabourg | Clay | F | Marguerite Broquedis [FRA] | d. | Daisy Speranza Wyns [FRA] | 6-4 6-2 | |