Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Champaign | 2021/07/28 17:25 | Yunseong Chung v Ben Shelton | 5-7,0-6 |
| Challenger Nur-Sultan | 2021/07/19 10:05 | Yunseong Chung v Hugo Grenier | 7-6,3-6,1-6 |
| Challenger Nur-Sultan | 2021/07/15 06:00 | Roman Safiullin v Yunseong Chung | 6-3,6-4 |
| Challenger Nur-Sultan | 2021/07/13 07:15 | Yunseong Chung v Yan Bondarevskiy | 6-3,6-4 |
| ITF M15 Monastir | 2021/05/27 08:30 | Yuta Kikuchi v Yunseong Chung | 2-6,6-3,1-6 |
| ITF M15 Monastir | 2021/05/26 09:30 | Louis Tessa v Yunseong Chung | 1-6,0-6 |
| ITF M15 Monastir | 2021/05/23 08:30 | Jeremy Beale v Yunseong Chung | 4-6,2-6 |
| ITF M15 Monastir | 2021/05/22 08:30 | Thomas Fancutt v Yunseong Chung | 5-7,4-6 |
| 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 |
| 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 |