Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF Qatar F5 | 2018/12/09 14:45 | Peter Kobelt v Bart Van Den Berg | 6-0,7-6 |
| ITF Qatar F4 | 2018/12/06 12:00 | Peter Kobelt v Michail Pervolarakis | 5-7,3-6 |
| ITF Qatar F4 | 2018/12/05 13:50 | Thomas Statzberger v Peter Kobelt | 6-7,4-6 |
| ITF Qatar F4 | 2018/12/04 12:00 | Peter Kobelt v Marc Giner | 6-2,6-1 |
| ITF Israel F12 | 2018/10/02 11:25 | Ram Kapach v Peter Kobelt | 6-4,6-4 |
| Challenger Winnetka Qual | 2018/07/08 15:00 | Peter Kobelt v Guy Orly Iradukunda | 3-6,4-6 |
| Challenger Winnetka Qual | 2018/07/07 16:30 | Peter Kobelt v Felix Corwin | 6-3,6-2 |
| ITF Israel F8 | 2018/06/09 09:05 | Yannick Jankovits v Peter Kobelt | 6-3,6-2 |
| ITF Qatar F5 | 2018/12/09 12:00 | Ivailo Keremedchiev v Constantin Schmitz | 6-7,4-6 |
| ITF Qatar F4 | 2018/12/03 13:55 | Constantin Schmitz v Niklas Schell | 4-6,3-6 |
| ITF Qatar F4 | 2018/12/02 14:55 | Constantin Schmitz v Eric Lavaud | 6-1,6-0 |
| ITF Germany F15 | 2018/10/09 11:00 | Jonathan Binding v Constantin Schmitz | 3-6,6-3,6-1 |
| ITF Germany F14 | 2018/10/05 11:45 | Paul Cayre v Constantin Schmitz | 6-3,6-2 |
| ITF Germany F14 | 2018/10/04 13:15 | Sandro Kopp v Constantin Schmitz | 2-6,2-6 |
| ITF Germany F14 | 2018/10/03 11:40 | Constantin Schmitz v Filip Duda | 6-4,6-2 |
| ITF Great Britain F4 | 2018/09/14 13:55 | Constantin Schmitz v Jack Draper | 2-6,1-6 |