Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Antalya | 2019/04/18 09:00 | Christopher Heyman v Koray Kirci | 6-2,6-1 |
| ITF Turkey F22 | 2018/06/07 09:05 | Christopher Heyman v Koray Kirci | 6-2,6-2 |
| ITF M15 Antalya | 2021/03/30 06:45 | Koray Kirci v Seong Chan Hong | 1-6,1-6 |
| ITF M15 Antalya | 2021/03/24 07:30 | Georgii Kravchenko v Koray Kirci | 6-3,3-6,6-3 |
| ITF M15 Antalya | 2021/03/18 08:45 | Nicholas David Ionel v Koray Kirci | 6-0,6-1 |
| ITF M15 Antalya | 2021/03/17 08:00 | Koray Kirci v Guy Den Heijer | 6-4,6-2 |
| ITF M15 Kazan | 2021/03/09 06:55 | Koray Kirci v Daniel Ibragimov | 4-6,6-7 |
| ITF M15 Kazan | 2021/03/08 10:20 | Koray Kirci v Roman Nashatyrkin | 6-3,7-6 |
| ITF M15 Antalya | 2021/02/24 10:00 | Koray Kirci v Dragos Nicolae Madaras | 2-6,0-6 |
| ITF M15 Antalya | 2021/02/07 06:00 | Dan Alexandru Tomescu v Koray Kirci | 6-3,6-1 |
| ITF M25 Meerbusch | 2021/04/13 13:15 | Markus Eriksson v Christopher Heyman | 7-6,5-7,6-4 |
| Challenger Oeiras Qual | 2021/04/04 12:20 | Christopher Heyman v Pedro Cachin | 1-6,2-6 |
| Challenger Lille | 2021/03/22 10:00 | Christopher Heyman v Jurgen Briand | 4-6,6-3,2-6 |
| Challenger Lille | 2021/03/21 09:00 | Adrian Andreev v Christopher Heyman | 4-6,6-3,3-6 |
| ITF M25 Vale Do Lobo | 2021/03/11 10:30 | Louis Dussin v Christopher Heyman | 0-6,6-4,7-6 |
| ITF M25 Vale Do Lobo | 2021/03/10 11:25 | Tiago Cacao v Christopher Heyman | 3-6,2-6 |
| ITF M15 Monastir | 2021/02/16 09:30 | Stuart Parker v Christopher Heyman | 4-6,6-1,6-3 |
| ITF M15 Monastir | 2021/02/09 11:25 | Alexis Gautier v Christopher Heyman | 6-1,7-6 |