| ITF M15 Platja D'Aro | 10/10 10:00 | 62 | Cizelj-Zivkovic, Stefan v Noah Lopez | 1-6,3-6 | |
| ITF M15 Platja D'Aro | 10/05 08:00 | 62 | Cizelj-Zivkovic, Stefan v Martinez Martinez, Jorge | 0-6,1-6 | |
| ITF M15 Platja D'Aro | 10/04 10:30 | 62 | Simon Beaupain v Cizelj-Zivkovic, Stefan | Walkover | |
| ITF M15 Platja D'Aro | 10/03 08:00 | 62 | Zhenxiong Dong v Cizelj-Zivkovic, Stefan | 4-6,4-6 | |
| ITF M15 Cairo | 09/12 08:00 | 62 | Andrei Cuceu v Cizelj-Zivkovic, Stefan | 6-4,6-3 | |
| ITF M15 Cairo | 09/05 08:30 | 62 | Lucio Carnevalle v Cizelj-Zivkovic, Stefan | 6-3,6-2 | |
| ITF M25 Velenje | 07/05 12:15 | 44 | Cizelj-Zivkovic, Stefan v Lukas Palovic | 3-6,1-6 | |
| ITF M25 Velenje | 07/04 07:30 | 44 | Cizelj-Zivkovic, Stefan v Mania, Marco | 7-6,6-0 | |
| ITF - M15 Tbilisi | 05/17 05:30 | 44 | Aleksandr Braynin v Cizelj-Zivkovic, Stefan | 6-4,6-3 | |
| ITF M15 Cairo | 04/18 07:00 | 62 | Kawakami, Rimpei v Cizelj-Zivkovic, Stefan | 6-2,6-2 | |
| ITF M15 Cairo | 04/11 08:00 | 62 | Cizelj-Zivkovic, Stefan v Andrea Gola | 1-6,2-6 | |
| ITF M15 La Nucia | 03/08 08:00 | 62 | Cizelj-Zivkovic, Stefan v Deleersnyder, Clement | 2-6,2-6 | |
| ITF - M15 Sharm El Sheikh | 01/31 13:30 | 62 | Luka Pavlovic v Cizelj-Zivkovic, Stefan | 6-1,6-2 | |
| ITF - M15 Héraklion | 02/23 08:00 | 44 | Cizelj-Zivkovic, Stefan v Ioannis Xilas | 3-6,3-6 | |
| ITF - M15 Héraklion | 02/16 11:00 | 44 | Cizelj-Zivkovic, Stefan v Simon, Sahar | 1-6,1-6 | |
| ITF - M15 Héraklion | 02/09 10:00 | 44 | Tanner, Gian Luca v Cizelj-Zivkovic, Stefan | 6-1,6-1 | |
| ITF - M15 Héraklion | 12/10 12:00 | 44 | Cizelj-Zivkovic, Stefan v Roggero, Tommaso | 1-6,2-6 | |
| ITF - M15 Héraklion | 12/09 11:00 | 44 | Dray, Eitan v Cizelj-Zivkovic, Stefan | 2-6,3-6 | |
| ITF - M15 Héraklion | 12/09 08:00 | 44 | Cizelj-Zivkovic, Stefan v Duric, Andrej | 6-1,6-1 | |
| ITF - M15 Héraklion | 12/01 09:00 | 44 | Stuart Parker v Cizelj-Zivkovic, Stefan | 6-1,6-1 | |
| ITF - M15 Héraklion | 11/24 10:30 | 44 | Keisidis, Christos v Cizelj-Zivkovic, Stefan | 6-4,6-2 | |
| ITF - M15 Sharm El Sheikh | 11/18 08:00 | 44 | Luca Potenza v Cizelj-Zivkovic, Stefan | 6-3,6-2 | |
| ITF - M15 Sharm El Sheikh | 11/17 08:00 | 44 | Connor, Preston v Cizelj-Zivkovic, Stefan | 0-6,2-6 | |
| ITF - M15 Sharm El Sheikh | 11/10 12:00 | 44 | Lahky, Nikolas v Cizelj-Zivkovic, Stefan | 6-1,6-4 | |
| ITF - M15 Sharm El Sheikh | 11/03 08:00 | 44 | Cizelj-Zivkovic, Stefan v Mohd Adam Das, Shamirul Shahril | 2-6,3-6 | |
| ITF - M15 Sharm El Sheikh | 10/27 10:00 | 44 | Riedel, Tim v Cizelj-Zivkovic, Stefan | 6-4,6-4 | |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 10/13 08:30 | 44 | Skierkier, Boruch v Cizelj-Zivkovic, Stefan | 6-1,6-0 | |
| Burgas, Singles Qualifying M-ITF-BUL-05A | 10/07 07:00 | 44 | Cizelj-Zivkovic, Stefan v Mikhaylyuk, Ivan | 4-6,0-6 | |
| ITF M15 Chornomorsk | 09/22 07:30 | 44 | Cizelj-Zivkovic, Stefan v Ilnytskyy, Svyatoslav | 2-6,5-7 | |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 09/15 13:00 | 44 | Cizelj-Zivkovic, Stefan v Francesco Liucci | 2-6,0-6 |