Stadium: V5 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Fort Worth | 2019/10/20 15:00 | Kyle Overmyer v Colin Markes | 1-6,0-6 |
| ITF M25 Norman | 2019/09/30 15:00 | Alexander Cozbinov v Colin Markes | 7-5,7-5 |
| ITF M25 Norman | 2019/09/29 15:00 | Colin Markes v Hunter Heck | 7-6,6-4 |
| 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 M25 Fort Worth | 2019/10/20 15:00 | Alfredo Perez v Finn Bass | 7-6,5-7,10-0 |
| ITF M25 Waco | 2019/10/14 17:00 | Luke Johnson v Alfredo Perez | 6-2,6-4 |
| ITF M25 Waco | 2019/10/13 20:00 | Dragos Constantin Ignat v Alfredo Perez | 1-6,4-6 |
| ITF M25 Edwardsville | 2019/08/07 18:55 | Petros Chrysochos v Alfredo Perez | 6-3,3-6,6-3 |
| ITF M25 Edwardsville | 2019/08/06 16:00 | Alfredo Perez v Jason Kerst | 6-1,6-1 |
| ITF M25 Edwardsville | 2019/08/05 14:00 | Alfredo Perez v Nathan Chavez | 6-1,6-2 |
| ITF M25 Decatur | 2019/08/01 18:00 | Jenson Brooksby v Alfredo Perez | 6-2,7-6 |
| ITF M25 Decatur | 2019/07/30 18:15 | Alfredo Perez v Alexander Klintcharov | 6-4,6-3 |