Stadium: Court 2 Round: 54 Ground: Clay
| ITF - M15 Héraklion | 2021/05/23 06:30 | Federico Arnaboldi v Johann, Lars | 6-1,6-2 |
| ITF - M15 Héraklion | 2021/05/17 07:00 | Johann, Lars v Sergis Kyratzis | 6-7,4-6 |
| ITF - M15 Héraklion | 2021/05/16 07:00 | Johann, Lars v Adam Jones | 7-6,2-6,10-4 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Johann, Lars v Sidane Pontjodikromo | 1-6,1-6 |
| ITF M25 Meerbusch | 2021/04/12 13:00 | Johann, Lars v Hermans, Mats | 6-3,2-6,3-10 |
| ITF M25 Meerbusch | 2021/04/12 09:00 | Johann, Lars v Patzanovsky, Christopher | 6-4,4-6,10-8 |
| ITF - M25 Trimbach | 2021/03/09 12:00 | Niklas Schell v Johann, Lars | 6-3,6-4 |
| ITF - M25 Trimbach | 2021/03/08 11:05 | Kaj Quirijns v Johann, Lars | 3-6,6-7 |
| ITF M15 Gaiba | 2021/06/08 11:20 | Giorgio Ricca v Yannik Steinegger | 6-3,5-7,10-7 |
| ITF M15 Gaiba | 2021/06/07 15:25 | Giovanni Agostinetto v Yannik Steinegger | 4-6,3-6 |
| ITF M15 Helsinki | 2021/06/03 07:00 | Yannik Steinegger v Bruno Kuzuhara | 2-6,6-2,3-6 |
| ITF M15 Helsinki | 2021/06/02 11:30 | Minakov, Mikhail v Yannik Steinegger | 4-6,1-6 |
| ITF M15 Helsinki | 2021/06/01 08:50 | Yannik Steinegger v Alexander Chepik | 6-4,6-3 |
| ITF M15 Helsinki | 2021/05/31 10:00 | Yannik Steinegger v Peetu Pohjola | 6-2,6-3 |
| ITF M15 Kouvola | 2021/05/27 12:35 | Yannik Steinegger v Otto Virtanen | 0-6,7-5,3-6 |
| ITF M15 Kouvola | 2021/05/26 15:20 | Sabanin, Yan v Yannik Steinegger | 2-6,2-6 |