Stadium: Court 2 Round: 28 Ground: Hardcourt indoor
| ITF M15 St Petersburg MD | 2021/04/09 12:20 | Paul/Steinegger v Cozbinov/Freund | 6-7,2-6 |
| ITF M15 St Petersburg MD | 2021/04/15 12:05 | Borisiouk/Liaonenka v Paul/Steinegger | 3-6,6-4,7-10 |
| ITF M15 St Petersburg MD | 2021/04/09 12:20 | Paul/Steinegger v Cozbinov/Freund | 6-7,2-6 |
| ITF M15 St Petersburg MD | 2021/04/08 11:00 | Paul/Steinegger v Binda/Minin | 6-0,6-2 |
| ITF M15 St Petersburg MD | 2021/04/07 10:55 | Altuna/Kravchuk v Paul/Steinegger | 6-3,3-6,6-10 |
| ITF M25 Biel MD | 2021/04/02 15:05 | Erler/Neuchrist v Paul/Steinegger | 6-3,4-6,10-2 |
| ITF M25 Biel MD | 2021/04/02 13:30 | Paul/Steinegger v Lehecka/Vrbensky | 7-5,6-4 |
| ITF M25 Biel MD | 2021/03/31 17:15 | Paul/Steinegger v Martinez/Nikles | 6-4,6-3 |
| ITF M25 Trimbach MD | 2021/03/13 15:15 | Paul/Steinegger v Ejupovic/Erler | 6-3,7-5 |
| ITF M15 St Petersburg MD | 2021/04/15 10:40 | Deviatiarov/Igoshin v Cozbinov/Freund | 2-6,6-3,6-10 |
| ITF M15 St Petersburg MD | 2021/04/13 12:15 | Shchaya-Zubrov/Sheyngezikht v Cozbinov/Freund | 6-7,2-6 |
| ITF M15 St Petersburg MD | 2021/04/10 12:40 | Cozbinov/Freund v Tajima/Zakharov | 6-4,7-5 |
| ITF M15 St Petersburg MD | 2021/04/09 12:20 | Paul/Steinegger v Cozbinov/Freund | 6-7,2-6 |