Stadium: Court 6 Round: 25 Ground: Clay
| Challenger Samarkand Qual | 2018/05/15 05:30 | Roman Safiullin v Marek Gengel | 6-2,3-6,6-3 |
| Challenger Samarkand Qual | 2018/05/13 05:00 | Marek Gengel v Luca Margaroli | 6-3,3-6,6-3 |
| Challenger Samarkand Qual | 2018/05/12 05:00 | Marek Gengel v Vladimir Polyakov | 6-1,6-1 |
| Challenger Karshi Qual | 2018/05/07 05:30 | Mukund Sasikumar v Marek Gengel | 6-2,6-4 |
| Challenger Karshi Qual | 2018/05/06 08:20 | Marek Gengel v Sidharth Rawat | 7-6,7-6 |
| Challenger Karshi Qual | 2018/05/05 06:05 | Amal Sultanbekov v Marek Gengel | 1-6,0-6 |
| Challenger Ostrava | 2018/05/01 12:10 | Adam Pavlasek v Marek Gengel | 6-2,6-3 |
| ITF Egypt F13 | 2018/04/12 08:00 | Pablo Vivero Gonzalez v Marek Gengel | 7-6,6-3 |
| ITF Czech Republic F1 | 2018/05/16 08:00 | Mikalai Haliak v Jan Mertl | 7-5,6-4 |
| Challenger Ostrava Qual | 2018/04/28 15:20 | Ivan Gakhov v Jan Mertl | 5-7,6-3,7-6 |
| ITF Tunisia F15 | 2018/04/17 09:00 | Finn Bass v Jan Mertl | 4-6,6-1,6-4 |
| ITF Tunisia F14 | 2018/04/12 09:00 | Jaime Pulgar-Garcia v Jan Mertl | 7-6,3-6,7-6 |
| ITF Tunisia F14 | 2018/04/10 10:35 | Franco Emanuel Egea v Jan Mertl | 4-6,2-6 |
| ITF Qatar F3 | 2018/03/15 11:30 | Jay Clarke v Jan Mertl | 6-1,7-6 |
| ITF Qatar F3 | 2018/03/14 14:15 | Florian Fallert v Jan Mertl | 3-6,1-6 |
| ITF Qatar F3 | 2018/03/13 12:00 | Jeroen Vanneste v Jan Mertl | 6-7,5-7 |