Stadium: Court 5 N Round: 54 Ground: Hardcourt outdoor
| 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 |
| ITF M25 Tulsa | 2021/06/14 18:00 | Nathan Ponwith v Joshua Sheehy | 6-3,6-4 |
| ITF M15 Fayetteville | 2020/11/03 19:00 | Nathan Ponwith v Brandon Holt | 2-6,4-6 |
| ITF M25 Orlando | 2019/11/12 19:00 | Adam Moundir v Nathan Ponwith | 4-6,7-6,6-4 |