Stadium: Stadium Round: 25 Ground: Clay
| 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 |
| ITF - M25 Weston | 2021/06/29 23:30 | Kyle Seelig v Jack Anthrop | 6-2,4-6,10-3 |
| ITF - M25 Weston | 2021/06/29 21:00 | Jack Anthrop v Nicholas Reyes | 6-4,6-4 |