Stadium: Court 1 Round: 25 Ground: Clay
| WTA Hamburg | 2021/07/05 10:55 | Sina Herrmann v Isabella Shinikova | 4-6,2-6 |
| ITF W25 Wroclaw | 2021/06/29 11:15 | Sina Herrmann v Valeriya Strakhova | 1-6,1-6 |
| ITF W25 Klosters | 2021/06/25 07:00 | Sina Herrmann v Ylena In-Albon | 4-6,2-6 |
| ITF W25 Klosters | 2021/06/24 08:40 | Sina Herrmann v Celine Naef | 6-3,6-3 |
| ITF W25 Klosters | 2021/06/23 12:15 | Bianca Turati v Sina Herrmann | 7-5,5-7,0-6 |
| ITF W25 Klosters | 2021/06/21 12:50 | Sina Herrmann v Joanne Zuger | 7-6,6-4 |
| ITF W25 Denain | 2021/06/15 11:50 | Guiomar Maristany Zuleta De Reales v Sina Herrmann | 6-1,6-3 |
| ITF W60 Saint-Gaudens | 2021/05/10 08:45 | Darya Astakhova v Sina Herrmann | 0-6,6-4,10-6 |
| ITF W25 Torino | 2021/07/08 10:10 | Cristina Dinu v Diane Parry | 1-6,6-2,5-7 |
| ITF W25 Torino | 2021/07/07 07:55 | Andrea Gamiz v Cristina Dinu | 5-7,2-6 |
| ITF W25 Torino | 2021/07/06 07:50 | Cristina Dinu v Jessie Aney | 6-1,6-0 |
| ITF W25 Torino | 2021/07/05 10:00 | Cristina Dinu v Elisa Andrea Camerano | 6-0,6-3 |
| ITF W25 Madrid | 2021/06/17 14:30 | Cristina Dinu v Melanie Stokke | 3-6,2-6 |
| ITF W25 Madrid | 2021/06/16 08:55 | Cristina Dinu v Karman Kaur Thandi | 1-6,7-6,6-2 |
| ITF W25 Madrid | 2021/06/15 07:00 | Victoria Bosio v Cristina Dinu | 6-1,1-6,5-10 |
| ITF W25 Madrid | 2021/06/14 09:30 | Maria Martinez Vaquero v Cristina Dinu | 0-6,2-6 |