Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Memphis | 2019/08/13 15:00 | Nathan Ponwith v Garrett Johns | 1-6,3-6 |
| Challenger Cary | 2021/09/14 15:00 | Aleksandar Kovacevic v Garrett Johns | 7-6,6-4 |
| ITF M15 Castelo Branco | 2021/07/29 08:30 | Garrett Johns v Gilbert S K Junior | 5-7,3-6 |
| ITF M15 Castelo Branco | 2021/07/27 08:30 | Evan Hoyt v Garrett Johns | 4-6,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/21 09:50 | Garrett Johns v Gilbert S K Junior | 5-7,1-6 |
| ITF M25 Idanha-A-Nova | 2021/07/20 08:00 | Garrett Johns v Raphael Lambling | 7-6,2-6,10-3 |
| ITF M25 Idanha-A-Nova | 2021/07/18 08:00 | Garrett Johns v Henrique Rocha | 6-3,6-1 |
| ITF M25 Idanha-A-Nova | 2021/07/15 11:30 | Garrett Johns v Anton Matusevich | 3-6,6-1,6-7 |
| ITF M25 Idanha-A-Nova | 2021/07/14 11:50 | Mehluli D A Sibanda v Garrett Johns | 1-6,5-7 |
| ITF M15 Fayetteville | 2021/09/21 17:00 | Nathan Ponwith v Juncheng Shang | 0-6,6-3,5-7 |
| ITF M15 Champaign | 2021/09/17 15:00 | Nathan Ponwith v Martin Damm | 6-7,4-6 |
| ITF M15 Champaign | 2021/09/16 17:00 | Nathan Ponwith v Blaise Bicknell | 6-2,6-4 |
| ITF M15 Champaign | 2021/09/15 19:40 | Ryan Shane v Nathan Ponwith | 5-7,2-6 |
| ITF M25 Decatur | 2021/08/04 18:45 | Yunseong Chung v Nathan Ponwith | 6-2,6-1 |
| ITF M25 Decatur | 2021/08/03 16:20 | Alexander Petrov v Nathan Ponwith | 2-6,4-6 |
| ITF M25 Decatur | 2021/08/02 15:00 | Toby D. Boyer v Nathan Ponwith | 1-6,3-6 |
| ITF M25 Champaign | 2021/07/28 21:45 | Naoki Nakagawa v Nathan Ponwith | 4-6,7-5,6-2 |