Stadium: Court 7 Round: 45 Ground: Clay
| Challenger Loughborough Qual | 2018/05/20 13:25 | Kern, Robin v Andrea Vavassori | 1-6,2-6 |
| Challenger Loughborough Qual | 2018/05/19 15:50 | Kern, Robin v Jack Draper | 6-4,6-4 |
| Challenger - Glasgow | 2018/05/03 13:30 | Guez, David v Kern, Robin | 4-6,7-6,6-4 |
| Challenger - Glasgow | 2018/05/02 10:30 | Bega, Alessandro v Kern, Robin | 1-6,3-6 |
| Challenger Glasgow Qual | 2018/04/29 09:30 | Kern, Robin v Kenneth Raisma | 7-6,7-6 |
| Challenger Glasgow Qual | 2018/04/28 09:00 | Kern, Robin v Kieran Macarty | 6-1,6-3 |
| ITF France F8 | 2018/04/23 16:30 | Kern, Robin v Gray, Jonathan | 3-6,2-6 |
| Challenger Lille Qual | 2018/03/17 09:00 | Geens, Clement v Kern, Robin | 2-6,6-2,6-3 |
| Challenger Mestre Qual | 2018/05/19 14:35 | Sekiguchi, Shuichi v Riccardo Bonadio | 1-6,2-6 |
| Challenger Samarkand Qual | 2018/05/12 07:50 | Sekiguchi, Shuichi v Mukund Sasikumar | 4-6,6-7 |
| Challenger Karshi | 2018/05/08 05:00 | Sekiguchi, Shuichi v Aldin Setkic | 1-6,5-7 |
| Challenger Karshi Qual | 2018/05/07 05:30 | Sekiguchi, Shuichi v Prashanth, N. Vijay Sundar | 6-7,6-4,7-6 |
| Challenger Karshi Qual | 2018/05/06 06:00 | Shyla, Yaraslau v Sekiguchi, Shuichi | 6-3,1-6,2-6 |
| Challenger Karshi Qual | 2018/05/05 06:35 | Sekiguchi, Shuichi v Fufygin, Mikhail | 4-6,6-4,6-1 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Ji Hoon Son v Sekiguchi, Shuichi | 6-2,7-6 |
| Challenger Nanchang Qual | 2018/04/15 03:00 | Sekiguchi, Shuichi v Li, Yuanfeng | 6-3,6-1 |