Stadium: Court 5 Round: 44
| ITF Women Guimaraes | 2018/06/24 09:00 | Maria Ines Fonte v Katriin Saar | 3-6,2-6 |
| ITF Women Guimaraes | 2018/06/23 09:00 | Klaudia Wira v Katriin Saar | 0-6,1-6 |
| 2018 Fed Cup | 2018/02/10 17:25 | Katriin Saar v Tena Lukas | 6-2,5-7,1-6 |
| 2018 Fed Cup | 2018/02/09 14:00 | Heather Watson v Katriin Saar | 6-1,6-1 |
| 2018 Fed Cup | 2018/02/08 14:00 | Katriin Saar v Francisca Jorge | 2-6,3-6 |
| ITF Women Helsinki | 2017/11/15 08:00 | Margaux Bovy v Katriin Saar | 6-0,6-2 |
| ITF Women Helsinki | 2017/11/13 08:00 | Katriin Saar v Naima Karamoko | 6-4,6-3 |
| ITF Women Helsinki Qual | 2017/11/12 08:00 | Aimee Tarun v Katriin Saar | 5-7,1-6 |
| ITF Women Guimaraes | 2018/06/24 09:00 | Almudena S-L Fernandez v Olga Helmi | 6-7,1-6 |
| ITF Women Amarante | 2018/06/21 14:30 | Olga Helmi v Alba Carrillo Marin | 4-6,2-6 |
| ITF Women Amarante | 2018/06/20 09:00 | Maria Joao Koehler v Olga Helmi | 3-6,2-6 |
| ITF Women Amarante | 2018/06/18 09:00 | Olga Helmi v Jane Stewart | 6-1,6-1 |
| ITF Women Amarante | 2018/06/17 09:00 | Olga Helmi v Iman Garshong | 6-0,6-1 |
| ITF Women Hammamet | 2018/05/23 09:00 | Miriana Tona v Olga Helmi | 6-1,6-0 |
| ITF Women Karlskrona | 2018/05/10 09:50 | Lisa Matviyenko v Olga Helmi | 6-1,6-1 |
| ITF Women Karlskrona | 2018/05/09 14:30 | Anette Munozova v Olga Helmi | 7-6,3-6,6-7 |