Round: 25 Ground: Hardcourt outdoor
| Challenger Busan Qual | 2018/05/12 02:55 | Yunseong Chung v Patael, Ben | 6-3,6-2 |
| ITF M15 Sozopol | 2021/10/16 09:30 | Billy Harris v Patael, Ben | 4-6,6-1,7-6 |
| ITF M15 Sozopol | 2021/10/15 10:00 | Patael, Ben v Terziev, Simeon | 6-4,6-2 |
| ITF M15 Sozopol | 2021/10/14 15:40 | Patael, Ben v Petr Nesterov | 6-4,3-6,10-6 |
| ITF M15 Sozopol | 2021/10/13 10:00 | Patael, Ben v Sandro Kopp | 6-0,6-0 |
| ITF M15 Sozopol | 2021/10/07 09:30 | Ilya Snitari v Patael, Ben | 6-3,6-2 |
| ITF M15 Sozopol | 2021/10/06 09:00 | Matic Dimic v Patael, Ben | 2-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/28 10:15 | Patael, Ben v Cabral, Francisco | 6-7,6-7 |
| ITF M25 Idanha-A-Nova | 2021/07/21 08:00 | Patael, Ben v Robin Bertrand | 1-6,3-6 |
| ITF M25 Meitar | 2021/11/03 09:55 | Bovy, Arnaud v Yunseong Chung | 6-4,3-6,6-4 |
| ITF M25 Meitar | 2021/11/02 08:00 | Joshua Luck v Yunseong Chung | 3-6,1-6 |
| Challenger Columbus | 2021/09/21 14:00 | Yunseong Chung v Nam, Ji Sung | 6-3,4-6,6-7 |
| Challenger Columbus | 2021/09/20 14:00 | Alexis Galarneau v Yunseong Chung | 4-6,4-6 |
| Challenger Columbus | 2021/09/19 18:35 | Boulais, Justin v Yunseong Chung | 6-7,3-6 |
| Winston-Salem, USA | 2021/08/21 20:10 | Yunseong Chung v Yosuke Watanuki | 3-6,6-7 |
| ITF M25 Decatur | 2021/08/06 17:10 | Yunseong Chung v Eliot Spizzirri | 4-6,4-6 |
| ITF M25 Decatur | 2021/08/05 17:55 | Jumpei Yamasaki v Yunseong Chung | 2-6,2-6 |