Stadium: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF W15 Sozopol | 2021/10/06 08:00 | Valentina Ryser v Yeon Woo Ku | 3-6,2-6 |
| ITF W25 Lisbon | 2021/09/28 14:25 | Tatjana Maria v Yeon Woo Ku | 6-1,7-6 |
| ITF W25 Lisbon | 2021/09/27 09:00 | Yeon Woo Ku v Murta, Ines | 6-4,6-1 |
| ITF W25 Lisbon | 2021/09/26 09:00 | Francisca Jorge v Yeon Woo Ku | 7-6,1-6,8-10 |
| ITF W15 Melilla | 2021/09/17 14:50 | Lucia L Domingo v Yeon Woo Ku | 7-6,2-6,6-3 |
| ITF W15 Melilla | 2021/09/17 10:40 | Claudia Martinez de Velasco v Yeon Woo Ku | 1-6,0-6 |
| ITF W15 Melilla | 2021/09/14 11:50 | Elena Jamshidi v Yeon Woo Ku | 2-6,0-6 |
| ITF W15 Aix-en-Provence | 2021/09/02 09:40 | Emeline Dartron v Yeon Woo Ku | 5-7,7-6,6-4 |
| ITF W15 Sozopol | 2021/10/05 09:00 | Shalamanova, Daria v Tsoneva, Mihaela | 4-6,3-6 |
| ITF W15 Sozopol | 2021/09/15 09:30 | Tsoneva, Mihaela v Julia Terziyska | 1-6,4-6 |
| ITF W15 Varna | 2021/09/08 12:15 | Tsoneva, Mihaela v Katerina Dimitrova | 2-6,4-6 |
| ITF Women Varna | 2021/09/06 13:00 | Tsoneva, Mihaela v Mila Masic | 6-2,6-1 |
| ITF Women Varna | 2021/09/06 07:30 | Laura Svatikova v Tsoneva, Mihaela | 6-7,7-6,4-10 |
| ITF Women Varna | 2021/09/05 10:00 | Tsoneva, Mihaela v Mariya Poduraeva | 6-1,6-2 |
| UTR Pro Tennis Series Sofia Women | 2021/09/03 08:30 | Daria Lodikova v Tsoneva, Mihaela | 6-1,1-6,5-2 |
| UTR Pro Tennis Series Sofia Women | 2021/09/02 08:30 | Silvia Costache v Tsoneva, Mihaela | 3-6,4-6 |