Stadium: Court 9 Round: 25 Ground: Hardcourt outdoor
| ITF - Cancun M15 | 2021/09/21 14:00 | Colin Markes v Nikolas Moceanu | 6-3,6-2 |
| ITF - Cancun M15 | 2021/09/20 14:00 | Colin Markes v Lance A L Castelan | 6-2,6-1 |
| ITF - Cancun M15 | 2021/09/19 14:00 | Colin Markes v Enzo Frances Tessari | 6-1,6-3 |
| UTR Pro Tennis Series - Dallas | 2021/09/05 13:00 | Tadeas Paroulek v Colin Markes | 6-3,6-2 |
| UTR Pro Tennis Series - Dallas | 2021/09/04 13:00 | Colin Markes v Kiranpal Pannu | 6-2,5-3 |
| UTR Pro Tennis Series - Dallas | 2021/09/03 13:00 | Colin Markes v Sander Jong | 1-6,6-4,2-5 |
| UTR Pro Tennis Series - Dallas | 2021/09/01 13:00 | Colin Markes v Stefan Latinov | 6-2,6-3 |
| UTR Pro Tennis Series - Dallas | 2021/08/31 15:00 | Colin Markes v Jerry Barton | 6-3,6-1 |
| Challenger Quito | 2021/09/14 16:50 | Mario Vilella Martinez v Christian Langmo | 6-3,6-7,6-2 |
| Challenger Quito | 2021/09/13 15:00 | Christian Langmo v Jorge Ruiz | 6-2,6-2 |
| ITF - Sintra M25 | 2021/09/08 09:00 | Christian Langmo v Shintaro Imai | 5-7,6-2,6-7 |
| ITF - Sierre M25 | 2021/08/31 12:20 | Christian Langmo v Valentin Vacherot | 6-7,4-6 |
| ITF - Lesa M25 | 2021/08/27 12:55 | Matias Franco Descotte v Christian Langmo | 6-3,6-4 |
| ITF - Lesa M25 | 2021/08/26 12:15 | Christian Langmo v Facundo Arias Bisso | 6-2,6-2 |
| ITF - Lesa M25 | 2021/08/25 13:45 | Simone Camposeo v Christian Langmo | 3-6,0-6 |
| ITF - Decatur M25 | 2021/08/03 15:00 | Christian Langmo v Rinky Hijikata | 6-4,3-6,4-10 |