Stadium: Court 6 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Kaarst | 2019/02/04 08:30 | van Der Meerschen, Martin v Koch, Niklas | 7-5,7-6 |
| ITF Netherlands F4 | 2018/08/11 09:00 | van Baal, Aloys Johannes Willem v Koch, Niklas | 6-1,6-2 |
| ITF Germany F10 Qual | 2018/07/29 15:30 | Mertens, Nico v Koch, Niklas | 6-4,7-6 |
| ITF Germany F10 Qual | 2018/07/29 08:00 | Koch, Niklas v Velasquez Meza, Javier Alonso | 6-1,6-0 |
| ITF Turkey F11 | 2018/03/17 07:00 | Xiviller, Nicolas v Koch, Niklas | 6-0,6-1 |
| ITF Italy F36 Qual | 2017/10/28 13:00 | Koch, Niklas v Lim, Harry | 6-7,4-6 |
| ITF Italy F35 Qual | 2017/10/21 08:00 | Martini, Ottaviano v Koch, Niklas | 6-1,6-2 |
| ITF Germany F1 Qual | 2016/01/10 08:00 | Koch, Niklas v Zick, Charly | 6-4,4-6,1-6 |
| ITF - M15 Monastir | 2019/12/02 12:30 | Garcia, Alejandro v Maik Steiner | 6-3,7-6 |
| ITF - M15 Monastir | 2019/12/02 08:00 | Theo Arribage v Maik Steiner | 2-6,0-6 |
| ITF - M15 Monastir | 2019/12/01 08:00 | Palm, Benjamin v Maik Steiner | 2-6,0-6 |
| ITF - M15 Monastir | 2019/11/04 08:00 | Maik Steiner v Telles, Leonardo | 4-6,3-6 |
| ITF - M15 Monastir | 2019/11/03 10:00 | Maik Steiner v David Quayle | 3-6,6-1,10-5 |
| ITF M25 Monastir | 2019/10/27 10:30 | Nagoudi, Adam v Maik Steiner | 7-6,2-6,10-6 |
| ITF M15 Ueberlingen | 2019/08/22 10:45 | Maik Steiner v Louis Wessels | 4-6,2-6 |
| ITF M15 Ueberlingen | 2019/08/21 08:00 | Maik Steiner v Moritz Hoffmann | 6-2,6-4 |