Stadium: Court 3 Round: 27 Ground: Hardcourt outdoor
| ITF M25 Decatur | 2021/08/05 17:55 | Jumpei Yamasaki v Yunseong Chung | 2-6,2-6 |
| ITF M25 Decatur | 2021/08/04 18:45 | Yunseong Chung v Nathan Ponwith | 6-2,6-1 |
| 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 M25 Decatur | 2021/08/05 18:35 | Eliot Spizzirri v Alfredo Perez | 5-7,6-1,6-1 |
| ITF M25 Decatur | 2021/08/04 16:55 | Preston Brown v Eliot Spizzirri | 0-6,3-6 |
| ITF M25 Decatur | 2021/08/03 15:00 | Eliot Spizzirri v Jesse Flores | 4-6,6-2,10-3 |
| ITF M25 Decatur | 2021/08/02 15:00 | Naoki Nakagawa v Eliot Spizzirri | 6-7,1-6 |
| ITF M25 Champaign | 2021/07/28 15:00 | Felix Corwin v Eliot Spizzirri | 7-5,7-6 |
| ITF M25 Champaign | 2021/07/27 15:00 | Connor Farren v Eliot Spizzirri | 3-6,2-6 |
| ITF M25 Champaign | 2021/07/26 15:00 | Parth Aggarwal v Eliot Spizzirri | 1-6,1-6 |
| ITF M15 Edwardsville | 2021/07/23 15:35 | Strong Kirchheimer v Eliot Spizzirri | 6-2,6-0 |