Stadium: M.A.R.A - Court Round: 27
| Challenger Eckental | 2018/10/31 17:00 | Evgeny Donskoy v Igor Sijsling | 6-1,6-1 |
| Challenger Eckental | 2018/10/29 10:00 | Alexander Bublik v Igor Sijsling | 3-6,0-6 |
| Challenger Eckental | 2018/10/28 10:00 | Igor Sijsling v Tobias Simon | 3-6,7-6,6-2 |
| Challenger Eckental | 2018/10/27 07:30 | Igor Sijsling v Lukas Klein | 7-6,6-3 |
| Challenger Como | 2018/08/25 12:10 | Igor Sijsling v Facundo Arguello | 5-7,1-6 |
| Challenger Lexington | 2018/07/31 17:55 | Ronnie Schneider v Igor Sijsling | 6-2,6-4 |
| ITF Germany F5 | 2018/06/27 15:25 | Filip Bergevi v Igor Sijsling | 6-1,6-2 |
| ITF Germany F5 | 2018/06/25 09:00 | Igor Sijsling v Jannik Rother | 6-1,6-3 |
| ITF Thailand F8 | 2018/11/04 02:00 | Lucas Gerch v Linh Giang Trinh | 6-7,6-4,6-1 |
| ITF Thailand F7 | 2018/10/30 07:05 | Lucas Gerch v Felix Corwin | 4-6,6-0,5-7 |
| ITF Turkey F31 | 2018/10/10 07:00 | Lucas Gerch v Michael Vrbensky | 3-6,6-1,3-6 |
| ITF Turkey F30 | 2018/10/06 07:00 | Lucas Gerch v George Von Massow | 6-7,7-6,4-6 |
| ITF Turkey F30 | 2018/10/04 10:05 | Alexander Lazov v Lucas Gerch | 7-6,3-6,3-6 |
| ITF Turkey F30 | 2018/10/02 09:00 | Sorin Andrei Iordache v Lucas Gerch | 6-7,4-6 |
| ITF Turkey F30 | 2018/10/01 07:30 | Lucas Gerch v Jonas Schaer | 6-4,6-4 |
| ITF Turkey F30 | 2018/09/30 07:30 | Lucas Gerch v Filippo Speziali | 6-1,6-1 |