Stadium: Court 4 Round: 28 Ground: Hardcourt outdoor
| US Open | 2021/08/30 19:10 | Grigor Dimitrov v Sam Riffice | 6-1,7-6,6-3 |
| Challenger Lexington | 2021/07/25 20:30 | Stefan Kozlov v Sam Riffice | 6-2,6-3 |
| Challenger Cary | 2021/07/22 18:00 | Sam Riffice v Prajnesh Gunneswaran | 2-6,4-6 |
| Challenger Cary | 2021/07/20 15:00 | Sam Riffice v Tatsuma Ito | 6-7,6-4,7-5 |
| ITF M25 Tulsa | 2021/06/19 14:00 | Genaro Alberto Olivieri v Sam Riffice | 7-6,7-6 |
| ITF M25 Tulsa | 2021/06/18 14:00 | Gage Brymer v Sam Riffice | 0-6,6-7 |
| ITF M25 Tulsa | 2021/06/17 14:00 | Sam Riffice v Jason Kubler | 6-1,6-4 |
| ITF M25 Tulsa | 2021/06/16 14:00 | Nathan Ponwith v Sam Riffice | 5-7,4-6 |
| ITF M15 East Lansing | 2021/11/18 18:00 | Alexander Brown v Garrett Johns | 6-4,1-6,6-1 |
| ITF M15 East Lansing | 2021/11/16 20:00 | A.J Catanzariti v Garrett Johns | 3-6,2-6 |
| ITF M15 Lubbock | 2021/09/30 16:15 | Henry Patten v Garrett Johns | 6-3,6-3 |
| ITF M15 Lubbock | 2021/09/28 15:00 | Garrett Johns v Nathan Ponwith | 6-3,6-2 |
| Challenger Cary | 2021/09/14 15:00 | Aleksandar Kovacevic v Garrett Johns | 7-6,6-4 |
| ITF M15 Castelo Branco | 2021/07/29 08:30 | Garrett Johns v Gilbert S K Junior | 5-7,3-6 |
| ITF M15 Castelo Branco | 2021/07/27 08:30 | Evan Hoyt v Garrett Johns | 4-6,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/21 09:50 | Garrett Johns v Gilbert S K Junior | 5-7,1-6 |