Stadium: Center Court Round: 26 Ground: Clay
| ITF Czech Republic F4 | 2017/07/05 08:00 | Bolardt, Antonin v Mertl, Jan | 6-3,5-7,3-6 |
| Czech Republic F2, Singles | 2017/05/25 09:00 | Mertl, Jan v Bolardt, Antonin | 6-3,6-3 |
| ITF Czech Republic F1 | 2016/05/10 11:35 | Bolardt, Antonin v Mertl, Jan | 1-6,2-6 |
| Czech Republic F2, Singles | 2018/05/23 08:00 | Bolardt, Antonin v Jiri Jenicek | 6-1,6-1 |
| ITF Czech Republic F2 Qual | 2018/05/21 09:30 | Bolardt, Antonin v Pechala, Frantisek | 6-4,6-2 |
| ITF Czech Republic F2 Qual | 2018/05/20 09:00 | Bolardt, Antonin v Cyprich, Lucas | 6-0,6-2 |
| ITF Czech Republic F1 | 2018/05/15 08:00 | Dan Added v Bolardt, Antonin | 6-7,7-5,6-2 |
| ITF Czech Republic F1 | 2018/05/14 08:00 | Bolardt, Antonin v Jiri Barnat | 4-6,6-2,6-2 |
| ITF Czech Republic F1 | 2018/05/13 08:00 | Bolardt, Antonin v Jiri Jenicek | 5-7,6-2,6-1 |
| ITF Poland F1 | 2018/05/01 07:30 | Bolardt, Antonin v Zizou Bergs | 6-4,3-6,6-7 |
| ITF Poland F1 | 2018/04/30 07:00 | Bolardt, Antonin v Wojnar, Bartosz | 6-3,7-6 |
| Czech Republic F2, Singles | 2018/05/23 13:40 | Marek Gengel v Mertl, Jan | 6-7,3-6 |
| ITF Czech Republic F1 | 2018/05/16 08:00 | Mikalai Haliak v Mertl, Jan | 7-5,6-4 |
| Challenger Ostrava Qual | 2018/04/28 15:20 | Ivan Gakhov v Mertl, Jan | 5-7,6-3,7-6 |
| Tunisia F15, Singles Qualifying | 2018/04/17 09:00 | Finn Bass v Mertl, Jan | 4-6,6-1,6-4 |
| Tunisia F14, Singles Qualifying | 2018/04/12 09:00 | Pulgar-Garcia, Jaime v Mertl, Jan | 7-6,3-6,7-6 |
| Tunisia F14, Singles Qualifying | 2018/04/10 10:35 | Franco Emanuel Egea v Mertl, Jan | 4-6,2-6 |
| Qatar F3, Singles | 2018/03/15 11:30 | Jay Clarke v Mertl, Jan | 6-1,7-6 |
| Qatar F3, Singles | 2018/03/14 14:15 | Fallert, Florian v Mertl, Jan | 3-6,1-6 |