Stadium: V5 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Chiswick | 2019/08/05 10:55 | Brandon Murphy v Colin Markes | 6-4,6-2 |
| ITF M15 Brussels | 2019/07/30 08:00 | Alexis Boureau v Colin Markes | 6-1,6-2 |
| ITF M15 Brussels | 2019/07/29 09:20 | David Tixhon v Colin Markes | 3-6,6-3,5-10 |
| ITF M25 Troyes | 2019/07/22 07:00 | Colin Markes v Mayeul Darras | 3-6,7-6,3-10 |
| ITF M25 Kassel | 2019/07/16 08:00 | Mats Rosenkranz v Colin Markes | 4-6,6-2,10-8 |
| ITF M15 Rochester | 2019/06/25 18:20 | Colin Markes v Kyle Seelig | 2-6,1-6 |
| ITF M15 Rochester | 2019/06/24 17:00 | Colin Markes v Nevin Arimilli | 5-7,7-6,10-8 |
| ITF M25 Tulsa | 2019/06/20 19:10 | Colin Markes v Alexander Sarkissian | 6-3,1-6,4-6 |