Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Lodz | 2021/08/17 08:00 | Aristotelis Thanos v Thijmen Loof | 6-1,6-3 |
| ITF M15 Lodz | 2021/08/16 09:30 | Aristotelis Thanos v Dmitrii Vasilev | 7-6,6-0 |
| UTR Pro Tennis Series Pazardzhik | 2021/07/13 09:00 | Aristotelis Thanos v Iliyan Radulov | 4-2 |
| UTR Pro Tennis Series Pazardzhik | 2021/07/12 07:30 | Dian Nedev v Aristotelis Thanos | 6-4,5-4 |
| ITF M15 Sofia | 2021/07/07 08:50 | Quentin Folliot v Aristotelis Thanos | 6-3,6-3 |
| ITF M15 Sofia | 2021/07/05 12:00 | Mattia Frinzi v Aristotelis Thanos | 7-5,2-6,7-10 |
| ITF M15 Sofia | 2021/07/05 07:00 | Stefanos Sakellaridis v Aristotelis Thanos | 2-6,6-7 |
| ITF M15 Sofia | 2021/07/04 07:30 | Benjamin Niv v Aristotelis Thanos | 0-6,4-6 |
| ITF M15 Gdynia | 2021/08/12 09:25 | Gilbert S K Junior v Daniel De Jonge | 5-7,1-6 |
| ITF M15 Gdynia | 2021/08/11 09:40 | Antonin Bolardt v Gilbert S K Junior | 6-2,1-6,2-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/07 07:00 | Gilbert S K Junior v Toby Alex Kodat | 6-1,6-7,3-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/05 08:30 | Filip Peliwo v Gilbert S K Junior | 3-6,5-7 |
| ITF M15 Castelo Branco | 2021/08/01 09:00 | Clement Chidekh v Gilbert S K Junior | 2-6,1-6 |
| ITF M15 Castelo Branco | 2021/07/31 08:30 | Joao Lucas Reis da Silva v Gilbert S K Junior | 6-4,2-6,6-7 |
| ITF M15 Castelo Branco | 2021/07/30 10:00 | Gilbert S K Junior v Sho Shimabukuro | 7-6,6-3 |
| ITF M15 Castelo Branco | 2021/07/29 08:30 | Garrett Johns v Gilbert S K Junior | 5-7,3-6 |