Stadium: Court Central Round: 26
| ITF Women Saint Gaudens | 2017/05/20 12:30 | Valentini Grammatikopoulou v Hogenkamp, Richel | 4-6,3-6 |
| ITF Women Saint Gaudens | 2018/05/16 08:00 | Valentini Grammatikopoulou v Kimberly Birrell | 4-6,7-5,6-2 |
| ITF Women Khimki | 2018/05/02 10:30 | Valentini Grammatikopoulou v Glushko, Julia | 4-6,6-7 |
| ITF Women Khimki | 2018/05/01 09:45 | Valentini Grammatikopoulou v Gabueva, Angelina | 6-7,7-6,6-4 |
| Fed Cup, Groupe Mondial | 2018/04/21 08:00 | Valentini Grammatikopoulou v Molinaro, Eleonora | 3-6,6-3,4-6 |
| Fed Cup, Groupe Mondial | 2018/04/20 08:00 | Clara Tauson v Valentini Grammatikopoulou | 7-6,6-7,0-6 |
| Fed Cup, Groupe Mondial | 2018/04/19 08:00 | Abo Habaga, Dona v Valentini Grammatikopoulou | 2-6,3-6 |
| WTA - Bogota | 2018/04/12 15:00 | Valentini Grammatikopoulou v Larsson, Johanna | 6-4,4-6,4-6 |
| WTA - Bogota | 2018/04/11 15:00 | Valentini Grammatikopoulou v Kato, Miyu | 5-7,6-4,6-4 |
| ITF Women Saint Gaudens | 2018/05/16 13:10 | Georges, Myrtille v Hogenkamp, Richel | 3-6,6-4,3-6 |
| WTA Prague | 2018/04/30 12:05 | Ekaterina Alexandrova v Hogenkamp, Richel | 7-6,6-1 |
| WTA Istanbul Qual | 2018/04/23 09:30 | Hogenkamp, Richel v Viktoriya Tomova | 1-6,2-6 |
| WTA Istanbul Qual | 2018/04/22 11:30 | Hogenkamp, Richel v Melis Sezer | 6-4,7-6 |
| Lugano, Switzerland | 2018/04/11 18:10 | Aliaksandra Sasnovich v Hogenkamp, Richel | 7-6,6-0 |
| WTA Lugano Qual | 2018/04/09 15:25 | Hogenkamp, Richel v Marie Bouzkova | 6-3,5-7,6-4 |
| WTA Lugano Qual | 2018/04/08 14:50 | Hogenkamp, Richel v Anne Schaefer | 6-0,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/04/03 20:10 | Hogenkamp, Richel v Elena-Gabriela Ruse | 3-6,2-6 |