| ITF M15 Nules | 11/14 14:00 | 44 | Gian Marco Ortenzi v Stefan Cizelj-Zivkovic | 6-0,6-0 | |
| ITF M15 Benicarlo | 11/07 08:30 | 62 | Tadas Babelis v Stefan Cizelj-Zivkovic | 6-1,6-3 | |
| ITF M15 Platja D'Aro | 10/10 10:00 | 62 | Stefan Cizelj-Zivkovic v Noah Lopez | 1-6,3-6 | |
| ITF M15 Platja D'Aro | 10/05 08:00 | 62 | Stefan Cizelj-Zivkovic v Jorge M Martinez | 0-6,1-6 | |
| ITF M15 Platja D'Aro | 10/04 10:30 | 62 | Simon Beaupain v Stefan Cizelj-Zivkovic | Walkover | |
| ITF M15 Platja D'Aro | 10/03 08:00 | 62 | Zhenxiong Dong v Stefan Cizelj-Zivkovic | 4-6,4-6 | |
| ITF M15 Cairo | 09/12 08:00 | 62 | Andrei Cuceu v Stefan Cizelj-Zivkovic | 6-4,6-3 | |
| ITF M15 Cairo | 09/05 08:30 | 62 | Lucio Carnevalle v Stefan Cizelj-Zivkovic | 6-3,6-2 | |
| ITF M25 Velenje | 07/05 12:15 | 44 | Stefan Cizelj-Zivkovic v Lukas Palovic | 3-6,1-6 | |
| ITF M25 Velenje | 07/04 07:30 | 44 | Stefan Cizelj-Zivkovic v Marco Mania | 7-6,6-0 | |
| ITF M15 Tbilisi | 05/17 05:30 | 44 | Aleksandr Braynin v Stefan Cizelj-Zivkovic | 6-4,6-3 | |
| ITF M15 Cairo | 04/18 07:00 | 62 | Rimpei Kawakami v Stefan Cizelj-Zivkovic | 6-2,6-2 | |
| ITF M15 Cairo | 04/11 08:00 | 62 | Stefan Cizelj-Zivkovic v Andrea Gola | 1-6,2-6 | |
| ITF M15 La Nucia | 03/08 08:00 | 62 | Stefan Cizelj-Zivkovic v Clement Deleersnyder | 2-6,2-6 | |
| ITF M15 Sharm El Sheikh | 01/31 13:30 | 62 | Luka Pavlovic v Stefan Cizelj-Zivkovic | 6-1,6-2 | |
| ITF M15 Heraklion | 02/23 08:00 | 44 | Stefan Cizelj-Zivkovic v Ioannis Xilas | 3-6,3-6 | |
| ITF M15 Heraklion | 02/16 11:00 | 44 | Stefan Cizelj-Zivkovic v Sahar Simon | 1-6,1-6 | |
| ITF M15 Heraklion | 02/09 10:00 | 44 | Gian Luca Tanner v Stefan Cizelj-Zivkovic | 6-1,6-1 | |
| ITF M15 Heraklion | 12/10 12:00 | 44 | Stefan Cizelj-Zivkovic v Tommaso Roggero | 1-6,2-6 | |
| ITF M15 Heraklion | 12/09 11:00 | 44 | Eitan Dray v Stefan Cizelj-Zivkovic | 2-6,3-6 | |
| ITF M15 Heraklion | 12/09 08:00 | 44 | Stefan Cizelj-Zivkovic v Andrej Duric | 6-1,6-1 | |
| ITF M15 Heraklion | 12/01 09:00 | 44 | Stuart Parker v Stefan Cizelj-Zivkovic | 6-1,6-1 | |
| ITF M15 Heraklion | 11/24 10:30 | 44 | Christos Keisidis v Stefan Cizelj-Zivkovic | 6-4,6-2 | |
| ITF M15 Sharm El Sheikh | 11/18 08:00 | 44 | Luca Potenza v Stefan Cizelj-Zivkovic | 6-3,6-2 | |
| ITF M15 Sharm El Sheikh | 11/17 08:00 | 44 | Preston Connor v Stefan Cizelj-Zivkovic | 0-6,2-6 | |
| ITF M15 Sharm El Sheikh | 11/10 12:00 | 44 | Nikolas Lahky v Stefan Cizelj-Zivkovic | 6-1,6-4 | |
| ITF M15 Sharm El Sheikh | 11/03 08:00 | 44 | Stefan Cizelj-Zivkovic v Shamirul S Mohd Adam Das | 2-6,3-6 | |
| ITF M15 Sharm El Sheikh | 10/27 10:00 | 44 | Tim Riedel v Stefan Cizelj-Zivkovic | 6-4,6-4 | |
| ITF M15 Tabarka | 10/13 08:30 | 44 | Boruch Skierkier v Stefan Cizelj-Zivkovic | 6-1,6-0 | |
| ITF M15 Burgas | 10/07 07:00 | 44 | Stefan Cizelj-Zivkovic v Ivan Mikhaylyuk | 4-6,0-6 |