Stadium: Hard 4 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Zlatibor | 2019/09/16 08:00 | Christos Keisidis v Roko Horvat | 1-6,5-7 |
| ITF M15 Zlatibor | 2019/09/15 06:30 | Tadija Radovanovic v Christos Keisidis | 2-6,1-6 |
| ITF M15 Heraklion | 2019/05/28 07:00 | Christos Keisidis v Gian Marco Ortenzi | 4-6,4-6 |
| ITF M15 Heraklion | 2019/05/27 07:00 | Calum Puttergill v Christos Keisidis | 4-6,3-6 |
| ITF M15 Heraklion | 2019/05/20 07:00 | Christos Keisidis v Moritz Thiem | 2-6,3-6 |
| ITF M15 Sozopol | 2019/05/07 09:00 | Boris Pokotilov v Christos Keisidis | 6-3,3-6,10-3 |
| ITF Bulgaria F1 | 2018/05/15 07:00 | Christos Keisidis v Alexander Igoshin | 4-6,6-1,1-6 |
| ITF Bulgaria F1 | 2018/05/13 07:00 | Zlatan Palazov v Christos Keisidis | 5-7,0-6 |
| ITF M15 Sharm El Sheikh | 2019/11/18 08:00 | Luca Potenza v Stefan Cizelj-Zivkovic | 6-3,6-2 |
| ITF M15 Sharm El Sheikh | 2019/11/17 08:00 | Preston Connor v Stefan Cizelj-Zivkovic | 0-6,2-6 |
| ITF M15 Sharm El Sheikh | 2019/11/10 12:00 | Nikolas Lahky v Stefan Cizelj-Zivkovic | 6-1,6-4 |
| ITF M15 Sharm El Sheikh | 2019/11/03 08:00 | Stefan Cizelj-Zivkovic v Shamirul S Mohd Adam Das | 2-6,3-6 |
| ITF M15 Sharm El Sheikh | 2019/10/27 10:00 | Tim Riedel v Stefan Cizelj-Zivkovic | 6-4,6-4 |
| ITF M15 Tabarka | 2019/10/13 08:30 | Boruch Skierkier v Stefan Cizelj-Zivkovic | 6-1,6-0 |
| ITF M15 Burgas | 2019/10/07 07:00 | Stefan Cizelj-Zivkovic v Ivan Mikhaylyuk | 4-6,0-6 |
| ITF M15 Chornomorsk | 2019/09/22 07:30 | Stefan Cizelj-Zivkovic v Svyatoslav Ilnytskyy | 2-6,5-7 |