Stadium: Court 20 Round: 26 Ground: Clay
| ITF M15 Monastir | 2021/11/10 08:00 | Stefan Popovic v Florent Bax | 0-6,1-6 |
| ITF M15 Ulcinj | 2021/08/31 08:00 | Dominik Palan v Stefan Popovic | 6-1,6-1 |
| ITF M15 Novi Sad | 2021/08/04 14:15 | Stefan Popovic v Francisco Comesana | 3-6,2-6 |
| ITF M15 Novi Sad | 2021/07/27 11:00 | Pedro Boscardin Dias v Stefan Popovic | 6-4,6-3 |
| ITF M15 Antalya | 2021/01/29 07:00 | Leopold Zima v Stefan Popovic | 6-2,6-2 |
| ITF M15 Antalya | 2021/01/29 06:30 | Credit Chaiyarin v Stefan Popovic | 1-6,1-6 |
| ITF M15 Antalya | 2021/01/28 08:00 | Stefan Popovic v Filip Bergevi | 6-3,6-2 |
| Eastern European Championship | 2020/07/30 09:40 | Daniil Savelev v Stefan Popovic | 1-6,0-6 |
| ITF M25 Poznan | 2021/08/22 08:00 | Taiyo Yamanaka v Dominique Graf | 7-6,1-6,8-10 |
| ITF M15 Lodz | 2021/08/16 13:15 | Taiyo Yamanaka v Admir Kalender | 3-6,7-6,10-7 |
| ITF M15 Lodz | 2021/08/16 09:30 | Taiyo Yamanaka v Dawid Taczala | 6-4,6-3 |
| ITF M25 Frankfurt am Main | 2021/08/12 11:10 | Taiyo Yamanaka v Mariano Kestelboim | 2-6,2-6 |
| ITF M25 Frankfurt am Main | 2021/08/11 11:15 | Adrian Oetzbach v Taiyo Yamanaka | 5-7,5-7 |
| ITF M25 Frankfurt am Main | 2021/08/10 10:30 | Taiyo Yamanaka v Niklas Schell | 6-1,6-2 |
| ITF M25 Frankfurt am Main | 2021/08/09 14:10 | Milan Welte v Taiyo Yamanaka | 6-7,4-6 |
| ITF M15 Novi Sad | 2021/08/02 11:00 | Ivailo Keremedchiev v Taiyo Yamanaka | 6-2,6-7,10-6 |