Stadium: Centre Court Round: 25 Ground: Clay
| ITF Belgium F8 | 2017/08/11 12:00 | Merckx, Jonas v Gigounon, Germain | 4-6,7-5,6-0 |
| Challenger Blois Qual | 2018/06/16 12:45 | Jacq, Gregoire v Gigounon, Germain | 7-5,6-1 |
| Challenger Lyon Qual | 2018/06/10 09:30 | Tatlot, Johan Sebastien v Gigounon, Germain | 6-4,6-1 |
| Challenger Lyon Qual | 2018/06/09 12:10 | Gigounon, Germain v Aleksandar Vukic | 6-0,7-6 |
| ITF Italy F12 | 2018/05/30 14:45 | Bortolotti, Marco v Gigounon, Germain | 6-3,6-4 |
| ITF Italy F12 | 2018/05/28 11:00 | Sebastian Korda v Gigounon, Germain | 5-7,3-6 |
| Challenger Braga | 2018/05/08 15:30 | Gastao Elias v Gigounon, Germain | 6-4,6-4 |
| Challenger Braga Qual | 2018/05/06 10:00 | Juan Pablo Ficovich v Gigounon, Germain | 4-6,6-4,6-7 |
| Challenger Braga Qual | 2018/05/05 11:55 | Gigounon, Germain v Vandenbulcke, Yannick | 6-4,6-4 |
| ITF Belgium F1 | 2018/06/22 11:00 | Yann Marti v Merckx, Jonas | 5-7,7-6,6-0 |
| ITF Belgium F1 | 2018/06/21 15:05 | Alexis Gautier v Merckx, Jonas | 4-6,3-6 |
| ITF Belgium F1 | 2018/06/19 09:55 | Herman, Louis v Merckx, Jonas | 3-6,0-6 |
| ITF Ukraine F3 | 2018/05/24 07:00 | Kolisnyk, Olexiy v Merckx, Jonas | 6-1,6-4 |
| ITF Ukraine F3 | 2018/05/23 09:25 | Myagkov, Dmitry v Merckx, Jonas | 1-6,3-6 |
| ITF Ukraine F3 | 2018/05/22 15:25 | Malakhov, Volodymyr v Merckx, Jonas | 1-6,1-6 |
| ITF Ukraine F2 | 2018/05/19 07:00 | Dolgosheyev, Oleg v Merckx, Jonas | 4-6,2-6 |
| ITF Ukraine F2 | 2018/05/18 09:30 | Merckx, Jonas v Kolisnyk, Olexiy | 6-3,6-3 |