Round: 25 Ground: Hardcourt outdoor
| ITF Bulgaria F1 | 2018/05/13 07:00 | Palazov, Zlatan v Keisidis, Christos | 5-7,0-6 |
| ITF Serbia F8 Qual | 2016/09/17 07:00 | Hiramatsu, Shinnosuke v Keisidis, Christos | 6-4,6-3 |
| ITF Serbia F7 Qual | 2016/09/11 10:00 | Gojo, Borna v Keisidis, Christos | 6-2,6-2 |
| ITF Serbia F7 Qual | 2016/09/10 13:30 | Keisidis, Christos v Vladusic, Nenad | 6-4,6-2 |
| Serbia F5, Singles | 2016/08/17 15:25 | Brkic, Tomislav v Keisidis, Christos | 6-1,4-6,6-2 |
| ITF Serbia F5 Qual | 2016/08/15 09:05 | Sabanov, Ivan v Keisidis, Christos | 4-6,3-6 |
| ITF Serbia F4 | 2016/08/10 12:55 | Keisidis, Christos v Markovic, Goran | 4-6,6-4,0-6 |
| ITF Serbia F4 Qual | 2016/08/08 07:30 | Bojanovic, Darko v Keisidis, Christos | 3-6,5-7 |
| ITF Egypt F17 | 2018/05/09 09:25 | Igoshin, Alexander v Krivokuca, Neven | 4-6,6-4,3-6 |
| ITF Egypt F16 | 2018/05/04 09:00 | Igoshin, Alexander v Jordan Correia Passos Do Carmo | 3-6,6-7 |
| ITF Egypt F16 | 2018/05/03 07:30 | Igoshin, Alexander v Broville, Maxence | 5-7,6-2,6-4 |
| Egypt F15, Singles Qualifying | 2018/04/24 08:00 | Boyer, Dusty H v Igoshin, Alexander | 6-4,3-6,7-5 |
| Challenger Guadalajara Qual | 2018/04/15 16:00 | Igoshin, Alexander v Escobar, Gonzalo | 5-7,1-6 |
| Challenger Guadalajara Qual | 2018/04/14 18:35 | Igoshin, Alexander v Federico Zeballos | 3-6,6-4,6-2 |
| Challenger Mexico City Qual | 2018/04/07 16:00 | Igoshin, Alexander v Franco Agamenone | 4-6,0-6 |
| Challenger Panama City Qual | 2018/03/31 17:00 | Igoshin, Alexander v Franco Agamenone | 2-6,3-6 |