Stadium: Hard Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Sozopol | 2021/10/10 09:00 | Ivan Penev v Gianluca Coloma-Heck | 6-1,6-3 |
| ITF M15 Sozopol | 2021/10/03 07:00 | Yann Wojcik v Gianluca Coloma-Heck | 6-1,7-5 |
| ITF M15 Monastir | 2021/08/22 10:00 | Mohamed Amin Oueslati v Gianluca Coloma-Heck | 3-6,6-4,10-5 |
| ITF M15 Monastir | 2021/08/15 07:30 | Gianluca Coloma-Heck v Syed Mohd Agil Syed Naguib | 4-6,2-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 07:30 | Robin Stanek v Gianluca Coloma-Heck | 6-1,6-1 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Vojtech Mares v Gianluca Coloma-Heck | 6-2,4-6,4-10 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 07:30 | Jakub Beran v Gianluca Coloma-Heck | 6-4,6-7,5-10 |
| ITF M15 Monastir | 2021/03/07 10:30 | Gianluca Coloma-Heck v Alexander Kotzen | 0-6,1-6 |
| ITF M15 Monastir | 2021/06/20 12:00 | Timur Kiyamov v Dong Ju Kim | 7-6,6-3 |
| ITF M15 Monastir | 2021/06/14 08:00 | Ajeet Rai v Dong Ju Kim | 5-7,6-4,12-10 |
| ITF M15 Monastir | 2021/06/13 11:30 | Lucas Cotler v Dong Ju Kim | 2-6,2-6 |
| ITF M15 Monastir | 2021/06/09 08:25 | Dong Ju Kim v Uisung Park | 2-6,1-6 |
| ITF M15 Monastir | 2021/06/07 13:30 | Dong Ju Kim v Sungbeen Sim | 6-0,3-6,10-7 |
| ITF M15 Monastir | 2021/06/07 09:00 | Kazuki Nishiwaki v Dong Ju Kim | 2-6,3-6 |
| ITF M15 Monastir | 2021/05/30 09:30 | Dong Ju Kim v Ren Nakamura | 7-5,6-7,5-10 |
| ITF M15 Monastir | 2021/05/24 12:30 | Uisung Park v Dong Ju Kim | 6-4,6-1 |