Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Edwardsville | 2021/07/20 14:30 | Griffith, William v Howard-Tripp, Joshua | 4-6,6-2,10-3 |
| ITF M15 Edwardsville | 2021/07/19 15:00 | Griffith, William v Richards, Alexander | 6-1,6-1 |
| ITF - M15 Héraklion | 2021/06/11 07:00 | Griffith, William v Billy Harris | 2-6,6-7 |
| ITF - M15 Héraklion | 2021/06/10 11:15 | Griffith, William v Cash, Julian | 7-5,7-6 |
| ITF - M15 Héraklion | 2021/06/09 11:45 | Marvin Moeller v Griffith, William | 4-6,4-6 |
| ITF - M15 Héraklion | 2021/06/08 06:30 | Graziani, Edoardo v Griffith, William | 6-1,4-6,4-10 |
| ITF - M15 Héraklion | 2021/06/07 07:30 | Ansari, Austin Ansari v Griffith, William | 1-6,1-6 |
| ITF - M15 Héraklion | 2021/06/06 11:00 | Podzimek, Floris v Griffith, William | 1-6,1-6 |
| 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 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/16 14:00 | Nathan Ponwith v Riffice, Sam | 5-7,4-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/15 16:30 | Nathan Ponwith v Axel Nefve | 6-4,6-4 |
| Tulsa, Singles Main, M-ITF-USA-16A | 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 |
| Orlando, Singles M-ITF-USA-38B | 2019/11/12 19:00 | Moundir, Adam v Nathan Ponwith | 4-6,7-6,6-4 |