Estádio: Court 1 Round: 19 Ground: Hardcourt outdoor
| Challenger - Granby | 2023/07/16 17:40 | Calum Puttergill v Joshua Sheehy | 4-6,6-7 |
| ITF - M25 Dallas | 2023/07/11 19:25 | Karl Poling v Joshua Sheehy | 6-4,3-6,6-3 |
| ITF - M15 Los Angeles | 2023/06/21 00:30 | Joshua Sheehy v Nicholas Godsick | 2-6,5-7 |
| ITF - M15 San Diego | 2023/06/13 21:00 | A.J Catanzariti v Joshua Sheehy | 3-6,7-5,6-4 |
| ITF - M15 Tabasco | 2023/05/26 17:00 | Ezekiel Clark v Joshua Sheehy | 6-3,6-7,7-6 |
| ITF - M15 Tabasco | 2023/05/25 17:00 | Joshua Sheehy v Andres Andrade | 4-6,6-4,6-4 |
| ITF - M15 Tabasco | 2023/05/24 16:00 | Jorge Panta v Joshua Sheehy | 3-6,6-7 |
| ITF - M15 Tabasco | 2023/05/22 23:00 | Joshua Sheehy v Justin Roberts | 6-3,6-3 |
| Challenger - Granby | 2023/07/16 15:00 | Colin Markes v Ernesto Escobedo | 6-1,6-3 |
| ITF - M25 Dallas | 2023/07/12 15:00 | Franco Ribero v Colin Markes | 4-6,6-3,7-6 |
| ITF - M25 Tulsa | 2023/06/21 15:40 | Jack Pinnington Jones v Colin Markes | 6-2,6-2 |
| ITF - M15 San Diego | 2023/06/15 17:00 | Alexander Kotzen v Colin Markes | 6-2,6-2 |
| ITF - M15 San Diego | 2023/06/14 19:15 | Jaycer Lyeons v Colin Markes | 7-6,3-6,3-6 |
| Challenger - Little Rock | 2023/05/29 15:00 | Beibit Zhukayev v Colin Markes | 6-0,6-3 |
| Challenger - 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 |