| ITF - W25 Madrid | 2021/06/06 09:00 | Mariia Kostiuk v Maria Garcia Cid | 1-6,1-6 |
| ITF - W25 Calvi | 2021/04/11 12:10 | Rebecca Amerio v Mariia Kostiuk | 6-4,6-1 |
| ITF - W25 Manacor | 2021/03/09 09:00 | Olga Parres Azcoitia v Mariia Kostiuk | 6-2,6-1 |
| ITF - W25 Selva Gardena | 2020/12/13 13:20 | Mariia Kostiuk v Verena Hofer | 3-6,3-6 |
| ITF - W15 LPD Gran Canaria | 2020/11/23 10:15 | Mariia Kostiuk v Rebeca Pereira | 1-6,0-6 |
| ITF - W15 LPD Gran Canaria | 2020/11/22 09:30 | Mariia Kostiuk v Maria Fernanda Morales | 6-3,6-1 |
| ITF Women Castellon | 2020/11/01 10:30 | Mariia Kostiuk v Maria B Bandera | 3-6,1-6 |
| ITF W15 - Platja D'Aro | 2020/10/25 11:00 | Ali Collins v Mariia Kostiuk | 7-5,6-3 |
| UTR Pro Tennis Series Barcelona - Feminin | 2021/06/08 09:30 | Sarah Tatu v Valentyna Ivakhnenko | 2-6,2-6 |
| ITF - W25 Liepaja | 2021/05/26 09:25 | Valentyna Ivakhnenko v Anna Zaja | 2-6,3-6 |
| ITF - W25 Platja d’Aro | 2021/05/19 09:00 | Andrea Lazaro Garcia v Valentyna Ivakhnenko | 6-2,6-4 |
| ITF - W60 La Bisbal | 2021/05/10 08:00 | Valentyna Ivakhnenko v Jessica Pieri | 0-6,2-6 |
| ITF - W60 La Bisbal | 2021/05/09 07:55 | Valentyna Ivakhnenko v Jessica Bouzas Maneiro | 3-6,6-1,10-7 |
| Australian Open - Feminin | 2021/01/11 07:40 | Giulia Gatto Monticone v Valentyna Ivakhnenko | 6-2,6-3 |
| ITF - W25 Prerov | 2020/09/23 08:00 | Valentyna Ivakhnenko v Elizabeth Halbauer | 2-6,7-5,6-7 |
| WTA - Praga | 2020/08/30 15:40 | Lara Arruabarrena v Valentyna Ivakhnenko | 7-5,6-1 |