| UTR Pro Malibu | 11/12 19:30 | - | Robert Shelton v Constantinos Koshis |
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| UTR Pro Malibu | 11/11 18:00 | - | Constantinos Koshis v Lucca Liu | 1-6,7-6,3-6 | |
| UTR Pro Newport Beach | 09/22 17:00 | - | Antreas Djakouris v Constantinos Koshis | 2-6,3-6 | |
| UTR Pro Newport Beach | 09/21 21:26 | - | Constantinos Koshis v Jordan Chiu | 7-6,6-3 | |
| UTR Pro Newport Beach | 09/20 17:00 | - | Raymond Sarmiento v Constantinos Koshis | 6-0,5-4 | |
| UTR Pro Newport Beach | 09/19 18:30 | - | Rithvik Krishna v Constantinos Koshis | 6-7,3-6 | |
| UTR Pro Newport Beach | 09/19 03:00 | - | Jayson Blando v Constantinos Koshis | 5-7,4-6 | |
| UTR Pro Newport Beach | 09/16 18:30 | - | Alessandro-Damiano Ventre v Constantinos Koshis | 7-6,6-2 | |
| ITF M15 Cordoba | 09/01 12:30 | 62 | Constantinos Koshis v Ignacio Novo | Walkover | |
| ITF M15 Limassol | 11/29 11:15 | 25 | Kevin Edengren v Constantinos Koshis | 6-3,6-2 | |
| ITF M15 Limassol | 11/22 10:15 | 25 | Menelaos Efstathiou v Constantinos Koshis | 6-3,6-3 | |
| ITF M25 Netanya | 06/26 09:20 | 44 | Constantinos Koshis v Emile Hudd | 6-7,6-7 | |
| ITF M25 Netanya | 06/25 08:00 | 44 | Constantinos Koshis v Tom Sorin | 7-5,6-1 | |
| ITF M25 Netanya | 06/19 12:00 | 44 | Constantinos Koshis v Fons Van Sambeek | 0-6,3-6 | |
| ITF M15 Winston-Salem | 11/08 19:00 | 25 | Alex Knaff v Constantinos Koshis | Retired | |
| ITF M15 Ithaca | 11/02 14:00 | 25 | Constantinos Koshis v Mwendwa Mbithi | 3-6,2-6 | |
| ITF M15 Norman | 10/26 17:00 | 25 | Alex Martinez v Constantinos Koshis | 6-2,6-1 | |
| ITF M15 Albuquerque | 09/27 16:00 | 25 | Osgar O'Hoisin v Constantinos Koshis | 6-2,6-1 | |
| ITF M15 Lubbock | 09/21 17:00 | 25 | Jordan Hasson v Constantinos Koshis | 6-3,6-3 | |
| ITF M25 Martos | 06/13 07:00 | 54 | Ignasi De Rueda De Genover v Constantinos Koshis | 6-2,6-0 | |
| ITF M15 Torello | 11/02 09:00 | 62 | Stefanos Sakellaridis v Constantinos Koshis | 1-6,6-4,10-8 | |
| ITF M25 Madrid | 09/14 09:05 | 62 | Nikolas S Izquierdo v Constantinos Koshis | 6-2,6-2 | |
| ITF M25 Madrid | 09/13 09:00 | 62 | Hermanni Tiainen v Constantinos Koshis | 4-6,4-6 | |
| ITF M15 Sharm El Sheikh | 02/02 07:30 | 62 | Aidan Mchugh v Constantinos Koshis | 6-2,6-4 | |
| ITF M15 Sharm El Sheikh | 02/01 10:30 | 62 | Constantinos Koshis v Robert Strombachs | 3-6,6-2,10-6 | |
| ITF M15 Sharm El Sheikh | 01/31 07:00 | 62 | Lucas Hellfritsch v Constantinos Koshis | 2-6,5-7 | |
| ITF M15 Antalya | 01/13 09:45 | 25 |
Constantinos Koshis v
Federico Arnaboldi
|
1-6,2-6 | |
| ITF M15 Antalya | 01/12 07:00 | 62 | Constantinos Koshis v Igor Trunov | 6-2,6-4 | |
| ITF M15 Antalya | 01/11 07:00 | 62 |
Billy Harris
v
Constantinos Koshis |
7-6,6-7,6-10 | |
| ITF M15 Antalya | 01/10 06:00 | 62 | Arda Azkara v Constantinos Koshis | 6-7,6-0,8-10 |
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