Stadium: Center Court Round: 14 Ground: Clay
| ITF Egypt F4 | 2018/02/05 09:00 | Johan Nikles v Lucas Gerch | 6-2,6-3 |
| Challenger Amersfoort | 2021/07/13 10:15 | Ryan Nijboer v Johan Nikles | 6-7,2-6 |
| Challenger Amersfoort | 2021/07/12 09:00 | Jeremy Jahn v Johan Nikles | 2-6,3-6 |
| Challenger Amersfoort | 2021/07/11 14:00 | Dominik Palan v Johan Nikles | 4-6,6-7 |
| ITF M25 The Hague | 2021/07/03 08:00 | Javier Barranco Cosano v Johan Nikles | 7-5,6-4 |
| ITF M25 The Hague | 2021/07/02 10:30 | Mateus Alves v Johan Nikles | 2-6,6-7 |
| ITF M25 The Hague | 2021/07/01 10:50 | Johan Nikles v Julian Ocleppo | 6-4,6-1 |
| ITF M25 Klosters | 2021/06/23 09:25 | Johan Nikles v Mohamed Aziz Dougaz | 2-6,7-6,3-6 |
| ITF M15 Genova | 2021/06/20 08:00 | Johan Nikles v Luca Nardi | 4-6,2-6 |
| ITF M25 The Hague | 2021/07/01 09:55 | Manuel Guinard v Lucas Gerch | 6-3,6-2 |
| ITF M25 The Hague | 2021/06/29 11:20 | Lucas Gerch v Vladimir Ivanov | 6-1,6-2 |
| Challenger Forli | 2021/06/16 09:30 | Francesco Forti v Lucas Gerch | 6-4,6-4 |
| Challenger Forli | 2021/06/15 09:30 | Lucas Gerch v Thiago Agustin Tirante | 7-6,3-6,6-3 |
| Challenger Forli | 2021/06/14 09:30 | Lucas Gerch v Elmar Ejupovic | 4-6,6-4,7-6 |
| Challenger Forli | 2021/06/13 09:45 | Alessandro Bega v Lucas Gerch | 3-6,1-6 |
| ITF M15 Antalya | 2021/05/28 08:20 | Pol Martin Tiffon v Lucas Gerch | 7-5,6-3 |
| ITF M15 Antalya | 2021/05/27 10:10 | Paul Woerner v Lucas Gerch | 7-5,6-7,3-6 |