Stadium: Court 2 Round: 19 Ground: Clay
| ITF W25 Kazan | 2019/03/14 07:00 | Viktoriya Tomova v Heisen, Vivian | 2-6,3-6 |
| WTA - Charleston | 2021/04/13 17:05 | Kovinic, Danka v Viktoriya Tomova | 6-3,6-3 |
| WTA - Bogota | 2021/04/10 15:00 | Viktoriya Tomova v Tamara Zidansek | 3-6,5-7 |
| WTA - Bogota | 2021/04/09 18:50 | Viktoriya Tomova v Nuria Parrizas-Diaz | 5-7,6-2,6-4 |
| WTA - Bogota | 2021/04/07 15:00 | Yafan Wang v Viktoriya Tomova | 3-6,3-6 |
| WTA - Bogota | 2021/04/05 15:00 | Anna-Lena Friedsam v Viktoriya Tomova | 2-6,3-6 |
| WTA - Miami | 2021/03/22 17:40 | Viktoriya Tomova v Tereza Martincova | 4-6,1-6 |
| WTA St. Petersburg | 2021/03/16 12:35 | Xinyu Wang v Viktoriya Tomova | 6-1,5-7,7-5 |
| WTA - Dubaï | 2021/03/08 17:00 | Viktoriya Tomova v Elise Mertens | 6-4,2-6,4-6 |
| WTA - Saint-Malo | 2021/05/02 10:20 | Heisen, Vivian v Leonie Kung | 3-6,6-4,6-2 |
| ITF W60 Bellinzona | 2021/04/06 09:55 | Heisen, Vivian v Zanevska, Maryna | 0-6,1-6 |
| ITF W60 Bellinzona | 2021/04/05 09:35 | Ochsner, Svenja v Heisen, Vivian | 6-3,1-6,8-10 |
| ITF W60 Bellinzona | 2021/04/04 11:55 | Heisen, Vivian v Marina Bassols Ribera | 6-1,6-3 |
| ITF W25 Kazan | 2021/03/10 07:00 | Heisen, Vivian v Urszula Radwanska | 2-6,5-7 |
| ITF W25 Orlando | 2020/11/12 15:40 | Black, Hurricane Tyra v Heisen, Vivian | 6-4,6-1 |
| ITF W25 Orlando | 2020/11/11 16:30 | Heisen, Vivian v Livianu, Jessica | 2-6,6-2,10-3 |
| ITF W25 Orlando | 2020/11/10 15:00 | Heisen, Vivian v Coleman, Elizabeth | 7-6,6-4 |