Stadium: Court 7 Round: 27 Ground: Hardcourt outdoor
| Challenger Columbus | 2021/09/19 17:35 | Evan King v Donald Young | 7-5,4-6,6-4 |
| Challenger Cary | 2021/09/13 23:25 | Donald Young v Denis Kudla | 6-7,6-4,2-6 |
| ATP Winston-Salem | 2021/08/21 19:45 | Donald Young v Tung-Lin Wu | 0-6,0-6 |
| ATP Atlanta | 2021/07/24 15:50 | Peter Gojowczyk v Donald Young | 6-4,6-1 |
| Challenger Cary | 2021/07/19 23:00 | Stefan Kozlov v Donald Young | 4-6,6-4,6-4 |
| UTR Pro Tennis Series Atlanta | 2021/07/07 16:30 | Mac Kiger v Donald Young | 7-6,2-6,0-5 |
| UTR Pro Tennis Series Atlanta | 2021/07/06 13:30 | Andrew Rogers v Donald Young | 1-6,6-4,7-6 |
| UTR Pro Tennis Series Atlanta | 2021/07/04 15:00 | Donald Young v Juan Pablo Cenoz | 2-6,6-4,5-1 |
| Challenger Lisbon | 2021/09/27 11:30 | Lucas Gerch v Daniel Michalski | 6-7,3-6 |
| Challenger Lisbon | 2021/09/26 10:45 | Christopher Heyman v Lucas Gerch | 4-6,7-6,5-7 |
| ITF M25 Pardubice | 2021/09/22 08:00 | Tim Handel v Lucas Gerch | 7-6,7-5 |
| ITF M25 Madrid | 2021/09/15 09:20 | Lucas Gerch v Alberto Barroso Campos | 4-6,6-7 |
| Challenger Seville | 2021/09/07 11:00 | Lucas Gerch v Carlos Taberner | 1-6,4-6 |
| Challenger Seville | 2021/09/06 09:00 | Mats Rosenkranz v Lucas Gerch | 3-6,7-5,4-6 |
| Challenger Seville | 2021/09/05 10:30 | Alberto Barroso Campos v Lucas Gerch | 2-6,1-6 |
| Challenger Warsaw | 2021/08/22 13:35 | Johan Nikles v Lucas Gerch | 6-4,7-5 |