Stadium: Court 2 Round: 25 Ground: Clay
| Rochester, Singles M-ITF-USA-19A | 2019/06/25 18:20 | Colin Markes v Seelig, Kyle | 2-6,1-6 |
| Rochester, Singles M-ITF-USA-19A | 2019/06/24 17:00 | Colin Markes v Arimilli, Nevin | 5-7,7-6,10-8 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2019/06/20 19:10 | Colin Markes v Sarkissian, Alexander | 6-3,1-6,4-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2019/06/19 17:40 | Lebedev, Alexander v Colin Markes | 3-6,5-7 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2019/06/18 17:40 | Colin Markes v Nicaise Muamba | 7-5,6-3 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2019/06/17 15:00 | Colin Markes v Frye, Bradley | 6-4,6-4 |
| USA F34, Singles | 2018/11/26 22:25 | Colin Markes v Brooksby, Jenson | 7-5,3-6,3-6 |
| USA F34, Singles | 2018/11/25 17:35 | Colin Markes v Bendeck, Jaime | 7-6,6-0 |
| ITF M15 Pittsburgh | 2019/07/02 14:00 | Wozniak, Michal v Harper, Cleeve | 2-6,4-6 |
| ITF M15 Pittsburgh | 2019/07/01 14:00 | Hills, Langford v Harper, Cleeve | 4-6,6-1,5-10 |
| Rochester, Singles M-ITF-USA-19A | 2019/06/24 17:00 | Volfson, David v Harper, Cleeve | 6-0,6-0 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2019/06/17 15:00 | Harper, Cleeve v Andrew Fenty | 4-6,6-4,6-10 |
| ITF M15 Cancun | 2019/06/10 18:00 | Harper, Cleeve v Damov, Kamen | 7-6,3-6,5-10 |
| ITF M15 Cancun | 2019/06/10 13:30 | Butts, Skyler v Harper, Cleeve | 1-6,3-6 |
| ITF M15 Champaign | 2019/06/03 15:00 | Zhang, Andrew v Harper, Cleeve | 6-1,6-7,10-2 |
| ITF Canada F4 Qual | 2018/06/24 17:00 | Ortiz, Adrian v Harper, Cleeve | 5-7,7-5,6-3 |