Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/05/10 12:30 | Fabio Coelho v Dong Ju Kim | 6-4,6-2 |
| ITF M15 Monastir | 2021/05/10 08:00 | Dong Ju Kim v Constantin Bittoun Kouzmine | 4-6,6-4,10-5 |
| ITF M15 Monastir | 2021/05/02 09:00 | Dong Ju Kim v Masamichi Imamura | 2-6,3-6 |
| ITF M15 Gimcheon | 2019/06/19 06:10 | Minjong Park v Dong Ju Kim | 6-4,6-0 |
| ITF M15 Gimcheon | 2019/06/10 01:00 | Dong Ju Kim v Sung Jun Park | 3-6,4-6 |
| ITF M15 Daegu | 2019/06/06 03:25 | Seong Chan Hong v Dong Ju Kim | 6-3,6-2 |
| ITF M15 Daegu | 2019/06/04 05:05 | TaeWoo Koo v Dong Ju Kim | 2-6,1-6 |
| Challenger Seoul | 2019/04/29 06:15 | Dong Ju Kim v Jeamoon Lee | 2-6,2-6 |
| ITF M15 Monastir | 2021/05/10 13:30 | Guy Orly Iradukunda v Mattia Frinzi | 6-4,4-6,4-10 |
| ITF M15 Monastir | 2021/05/10 09:00 | Francesco Cano v Mattia Frinzi | 2-6,5-7 |
| ITF M15 Monastir | 2021/05/09 10:00 | Jason Janis v Mattia Frinzi | 3-6,1-6 |
| ITF M15 Monastir | 2021/05/04 08:00 | Yuta Kawahashi v Mattia Frinzi | 6-2,7-5 |
| ITF M15 Monastir | 2021/05/03 12:00 | Luca Castagnola v Mattia Frinzi | 2-6,6-7 |
| ITF M15 Monastir | 2021/05/02 12:00 | Theo Arribage v Mattia Frinzi | 6-7,1-6 |
| ITF M15 Opatija | 2021/03/23 10:20 | Aleksandre Bakshi v Mattia Frinzi | 6-2,6-3 |
| ITF M15 Opatija | 2021/03/22 13:15 | Stefan Loncar v Mattia Frinzi | 3-6,6-7 |