Stadium: CAETANO DRIVE Round: 25
| ITF Women Guimaraes | 2018/07/01 13:00 | Koehler, Maria Joao v Zeel Desai | 6-1,3-6,6-1 |
| ITF Women Guimaraes | 2018/06/29 10:00 | Theo Gravouil v Koehler, Maria Joao | 2-6,2-6 |
| ITF Women Guimaraes | 2018/06/28 10:00 | Karola Patricia Bejenaru v Koehler, Maria Joao | 3-6,1-6 |
| ITF Women Guimaraes | 2018/06/27 11:45 | Bertschmann, Stephanie v Koehler, Maria Joao | 0-6,0-6 |
| ITF Women Amarante | 2018/06/20 09:00 | Koehler, Maria Joao v Olga Helmi | 3-6,2-6 |
| Obidos, Singles W-WITF-POR-12A | 2018/06/14 13:55 | Koehler, Maria Joao v Lulu Sun | 0-6,3-6 |
| Obidos, Singles W-WITF-POR-12A | 2018/06/13 14:45 | Olga Parres Azcoitia v Koehler, Maria Joao | 0-6,4-6 |
| Obidos, Singles W-WITF-POR-12A | 2018/06/06 12:05 | Laura Ioana Paar v Koehler, Maria Joao | 6-2,6-1 |
| ITF Women Amarante | 2018/06/22 09:30 | Carrillo Marin, Alba v Zakarlyuk, Marianna | 3-6,7-6,7-6 |
| ITF Women Amarante | 2018/06/21 09:00 | Aponasenko, Vasilisa v Zakarlyuk, Marianna | 0-6,1-6 |
| ITF Women Amarante | 2018/06/19 11:00 | Karola Patricia Bejenaru v Zakarlyuk, Marianna | 3-6,7-6,3-6 |
| Obidos, Singles W-WITF-POR-12A | 2018/06/14 09:30 | Gatto-Monticone, Giulia v Zakarlyuk, Marianna | 6-2,7-5 |
| Obidos, Singles W-WITF-POR-12A | 2018/06/13 15:25 | Zakarlyuk, Marianna v Sara Lanca | 6-4,6-4 |
| ITF Women Banja Luka | 2018/06/09 08:00 | Zakarlyuk, Marianna v Takamura, Satsuki | 6-2,6-7,3-6 |
| ITF Women Banja Luka | 2018/06/07 08:00 | Zakarlyuk, Marianna v Stella Kovacicova | 6-1,3-6,6-3 |
| ITF Women Banja Luka | 2018/06/05 09:15 | Zakarlyuk, Marianna v Malesevic, Tamara | 6-1,6-2 |