Stadium: Court 6 N Round: 25 Ground: Hardcourt outdoor
| ITF - M15 - Monastir | 2021/06/01 09:00 | Naoki Nakagawa v Jeremy Beale | 4-6,7-6,4-6 |
| ITF - M15 - Monastir | 2021/05/29 08:30 | Eliakim Coulibaly v Naoki Nakagawa | 6-4,4-6,7-5 |
| ITF - M15 - Monastir | 2021/05/28 09:30 | Naoki Nakagawa v Santiago Rodriguez Taverna | 6-3,6-7,6-1 |
| ITF - M15 - Monastir | 2021/05/27 08:30 | Naoki Nakagawa v Bautista Vilicich | 6-2,6-2 |
| ITF - M15 - Monastir | 2021/05/25 08:30 | David Poljak v Naoki Nakagawa | 6-7,7-6,1-6 |
| ITF M15 - Antalya | 2021/05/19 07:30 | Naoki Nakagawa v Marsel Ilhan | 6-7,4-6 |
| ITF M15 - Antalya | 2021/05/14 07:00 | Nick Hardt v Naoki Nakagawa | 6-2,6-0 |
| ITF M15 - Antalya | 2021/05/13 06:50 | Naoki Nakagawa v Ivan Nedelko | 4-6,7-6,6-3 |
| ITF M25 - Champaign | 2021/07/27 17:05 | Nathan Ponwith v Jibril Nettles | 7-5,6-2 |
| ITF M25 - Champaign | 2021/07/26 15:00 | Nathan Ponwith v Ozan Baris | 7-6,6-2 |
| ITF M15 - Edwardsville | 2021/07/21 21:50 | William Griffith v Nathan Ponwith | 7-5,6-4 |
| ITF M15 - Champaign | 2021/06/23 15:00 | Jason Kubler v Nathan Ponwith | 7-5,6-1 |
| ITF M15 - Champaign | 2021/06/22 15:00 | Nathan Ponwith v Michael Zheng | 6-3,6-1 |
| ITF M15 - Champaign | 2021/06/21 15:00 | Nathan Ponwith v Hunter Heck | 6-1,6-3 |
| ITF M25 - Tulsa | 2021/06/16 14:00 | Nathan Ponwith v Sam Riffice | 5-7,4-6 |
| ITF M25 - Tulsa | 2021/06/15 16:30 | Nathan Ponwith v Axel Nefve | 6-4,6-4 |