Stadium: Hard 21 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Heraklion | 2021/11/09 07:00 | Dax Donders v Charles Tzicas | 6-1,6-0 |
| ITF M15 Heraklion | 2021/11/08 09:00 | Dax Donders v Mike Loccisano | 6-2,6-1 |
| ITF M15 Heraklion | 2021/11/07 11:00 | Dax Donders v Axel Bergdahl | 6-0,6-2 |
| ITF M25 Eupen | 2021/09/07 07:30 | Dax Donders v Rayane Oumaouche | 4-6,3-6 |
| ITF M25 Eupen | 2021/09/06 13:05 | Dax Donders v Andre Megrabian | 6-4,6-3 |
| ITF M25 Eupen | 2021/09/05 10:30 | Dax Donders v Stephan Iserath | 6-2,6-2 |
| ITF M15 Oldenzaal | 2021/08/15 14:00 | Dax Donders v Arthur Van Der Kooij | 6-1,6-4 |
| ITF M25 Marburg | 2021/07/05 10:35 | Christoph Negritu v Dax Donders | 7-6,7-6 |
| ITF M15 Heraklion | 2021/11/09 07:00 | Leon Hoeveler v Dong Ju Kim | 1-6,5-7 |
| ITF M15 Heraklion | 2021/11/08 11:00 | Jonathan Backman v Dong Ju Kim | 4-6,4-6 |
| ITF M15 Heraklion | 2021/11/07 11:00 | Gianluca Coloma-Heck v Dong Ju Kim | 2-6,1-6 |
| 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 |