Stadium: Court 10 Round: 54 Ground: Hardcourt outdoor
| 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 | Yan Sabanin v Yannik Steinegger | 2-6,2-6 |
| ITF M15 Kouvola | 2021/05/25 07:00 | Yannik Steinegger v Tommy Hellstrom | 6-1,6-0 |
| ITF M15 Troisdorf | 2021/05/11 08:00 | Tom Kocevar-Desman v Yannik Steinegger | 6-3,6-1 |
| ITF M15 Troisdorf | 2021/05/10 11:00 | Leopold Zima v Yannik Steinegger | 2-6,6-7 |
| ITF M15 Troisdorf | 2021/05/09 13:00 | Yannik Steinegger v Milan Welte | 6-4,6-2 |
| ITF M15 St Petersburg Qual | 2021/04/11 14:25 | Daniel Ibragimov v Yannik Steinegger | 4-6,6-4,10-7 |
| ITF M15 St Petersburg | 2021/04/05 11:00 | Daniil Glinka v Yannik Steinegger | 6-2,6-2 |
| ITF M15 Kouvola | 2021/05/25 10:00 | Lorenzo Rottoli v Peetu Pohjola | 7-6,6-2 |