Stadium: M.A.R.A - Court Round: 26
| 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 M15 Veigy-Foncenex | 2019/01/21 19:15 | Mick Veldheer v Yannik Steinegger | 5-7,6-3,10-3 |
| ITF M15 Veigy-Foncenex | 2019/01/21 16:00 | Mick Veldheer v Hugo Pierre | 6-2,6-4 |
| ITF Turkey F41 | 2018/12/20 09:15 | Mick Veldheer v Gorazd Srbljak | 4-6,2-6 |
| ITF Turkey F40 | 2018/12/13 07:00 | Mick Veldheer v Tadeas Paroulek | 7-5,4-6,2-6 |
| ITF Turkey F40 | 2018/12/11 07:00 | Vladimir Korolev v Mick Veldheer | 7-5,1-6,3-6 |
| ITF Turkey F39 | 2018/12/05 09:55 | Mick Veldheer v Bart Stevens | 5-7,2-6 |
| ITF Turkey F33 | 2018/10/25 07:00 | Mick Veldheer v Peter Heller | 1-6,1-6 |
| ITF Turkey F33 | 2018/10/23 07:55 | Mick Veldheer v Shendrit Deari | 6-2,6-0 |