Stadion: Stadium Court Round: 19 Ground: Clay
| Challenger - Tallahassee | 2021/04/18 20:00 | Donald Young v Evan King | 6-1,6-2 |
| Challenger - Cleveland | 2021/03/17 23:35 | Alexis Galarneau v Donald Young | 7-5,7-5 |
| Challenger - Cleveland | 2021/03/15 20:25 | Donald Young v Go Soeda | 6-3,6-7,7-5 |
| ATP - Delray Beach | 2021/01/09 01:30 | Frances Tiafoe v Donald Young | 6-3,6-4 |
| ATP - Delray Beach | 2021/01/06 16:00 | Donald Young v Stefan Kozlov | 4-6,6-4,6-4 |
| ATP - Delray Beach | 2021/01/05 15:40 | Pedro Sakamoto v Donald Young | 6-3,4-6,2-6 |
| GTS Atlanta Exhibition | 2020/09/18 15:00 | Donald Young v Nathan Pasha | 6-3,7-5 |
| GTS Atlanta Exhibition | 2020/09/17 14:00 | Ruan Roelofse v Donald Young | 1-6,1-5 |
| Challenger - Tallahassee | 2021/04/18 19:30 | Aleksandar Kovacevic v Filip Cristian Jianu | 4-6,7-5,6-7 |
| Challenger - Oeiras - Qualifikation | 2021/04/04 10:00 | Kaichi Uchida v Filip Cristian Jianu | 2-6,5-7 |
| Challenger - Lille | 2021/03/25 09:30 | Maxime Janvier v Filip Cristian Jianu | 6-7,6-3,6-3 |
| Challenger - Lille | 2021/03/24 09:30 | Filip Cristian Jianu v Alexandre Muller | 2-6,6-2,7-5 |
| Challenger - Lille | 2021/03/22 12:05 | Baptiste Crepatte v Filip Cristian Jianu | 6-2,6-1 |
| Challenger - Lille | 2021/03/21 15:15 | Martin Breysach v Filip Cristian Jianu | 3-6,3-6 |
| Challenger - Gran Canaria | 2021/03/02 11:40 | Carlos Alcaraz Garfia v Filip Cristian Jianu | 6-3,6-7,6-1 |
| Challenger - Gran Canaria | 2021/03/01 11:00 | Filip Cristian Jianu v Sadio Doumbia | 6-2,6-3 |