Estadio: Court 16 Round: 26 Ground: Hardcourt outdoor
| ITF M15 San Diego | 2023/06/14 20:50 | Derek Pham v Alexander Kotzen | 7-6,5-7,0-6 |
| ITF M15 San Diego | 2023/06/13 17:30 | Alexander Kotzen v Adam Jones | 6-1,6-0 |
| ITF M15 San Diego | 2023/06/08 17:00 | Alexander Kotzen v Connor Farren | 3-6,1-6 |
| ITF M15 San Diego | 2023/06/07 17:25 | Govind Nanda v Alexander Kotzen | 5-7,1-6 |
| ITF M25 Malibú | 2023/01/06 18:00 | Arthur Fery v Alexander Kotzen | 6-4,6-4 |
| ITF M25 Malibú | 2023/01/05 22:00 | Ishaan Ravichander v Alexander Kotzen | 1-6,6-7 |
| UTR Pro Tennis Series - California | 2022/12/23 17:30 | Alexander Kotzen v Chase Thompson | 6-4,6-5 |
| UTR Pro Tennis Series - California | 2022/12/23 01:48 | Alexander Kotzen v Maxwell McKennon | 6-3,6-1 |
| ITF M15 San Diego | 2023/06/14 19:15 | Jaycer Lyeons v Colin Markes | 7-6,3-6,3-6 |
| Challenger de Little Rock | 2023/05/29 15:00 | Beibit Zhukayev v Colin Markes | 6-0,6-3 |
| Challenger de Little Rock | 2023/05/28 17:35 | Colin Markes v Strong Kirchheimer | 5-7,7-6,7-6 |
| ITF M25 Pensacola | 2023/05/17 15:40 | Colin Markes v Jonah Braswell | 2-6,1-6 |
| ITF M15 Orange Park | 2023/05/05 18:10 | Matias Franco Descotte v Colin Markes | 6-4,6-7,6-0 |
| ITF M15 Orange Park | 2023/05/04 14:15 | Colin Markes v Rei Sakamoto | 5-7,6-4,6-2 |
| ITF M15 Orange Park | 2023/05/03 16:35 | Oren Vasser v Colin Markes | 2-6,1-6 |
| ITF M15 Vero Beach | 2023/04/27 14:40 | Jacob Brumm v Colin Markes | 7-6,6-1 |