| ITF M15 Kursumlijska Banja | 04/24 17:00 | 62 | Stefan Cizelj-Zivkovic v Michal Krajci | 7-6,3-6,2-10 | |
| ITF M15 Kursumlijska Banja | 04/22 11:30 | 62 | Stefan Cizelj-Zivkovic v Andrej Radojicic | 7-5,6-7,10-7 | |
| ITF M25 Badalona | 03/18 12:30 | 62 | Kane Bonsach Ganley v Stefan Cizelj-Zivkovic | 6-1,6-1 | |
| ITF M15 Villena | 02/25 13:00 | 62 | Stefan Cizelj-Zivkovic v Albert Pedrico Kravtsov | 1-6,2-6 | |
| ITF M15 Villena | 02/18 12:00 | 62 | Stefan Cizelj-Zivkovic v Jack Loge | 1-6,2-6 | |
| ITF M25 Madrid | 12/03 10:30 | 62 | Eero Vasa v Stefan Cizelj-Zivkovic | 6-3,6-3 | |
| ITF M25 Madrid | 11/28 09:00 | 62 | Stijn Slump v Stefan Cizelj-Zivkovic | 6-4,6-2 | |
| ITF M15 Valencia | 11/12 10:00 | 62 | Stefan Cizelj-Zivkovic v Noah Perfetti | 3-6,1-6 | |
| ITF M25 Benicarló | 11/05 08:30 | 62 | Stefan Cizelj-Zivkovic v Nicolas Rafael Goldberg Alviani | 1-6,1-6 | |
| ITF M15 Heraklion | 10/23 07:30 | 44 | Stefan Cizelj-Zivkovic v Alexander Orlov | 2-6,6-2,11-13 | |
| ITF M15 Heraklion | 10/22 08:30 | 44 | Gabriel Matuszewski v Stefan Cizelj-Zivkovic | 4-6,4-6 | |
| ITF M15 Heraklion | 10/15 07:00 | 44 | Stefan Cizelj-Zivkovic v Graham Maassen | 3-6,3-6 | |
| ITF M15 Kursumlijska Banja | 09/17 08:30 | 44 | Stefan Cizelj-Zivkovic v Jerko Brkic | 3-6,6-4,8-10 | |
| ITF M15 Kursumlijska Banja | 09/10 09:30 | 44 | Alexandar Balj v Stefan Cizelj-Zivkovic | 6-2,6-2 | |
| ITF M15 Madrid | 09/05 10:00 | 19 | Stefan Cizelj-Zivkovic v Luis Francisco | 3-6,2-6 | |
| ITF M15 Madrid | 09/04 07:30 | 62 | Stefan Cizelj-Zivkovic v Cian Maguire | 6-3,6-7,10-6 | |
| ITF M15 Madrid | 09/03 12:00 | 62 | Tommaso Carnevale-Miino v Stefan Cizelj-Zivkovic | 6-7,2-6 | |
| ITF M25 Gandia | 07/17 10:00 | 62 | Patricio Alvarado v Stefan Cizelj-Zivkovic | 6-4,6-2 | |
| ITF M15 Kursumlijska Banja | 06/14 10:20 | 25 | Stefan Cizelj-Zivkovic v Dusan Obradovic | 4-6,1-6 | |
| ITF M25 Kursumlijska Banja | 06/06 10:40 | 44 | Stefan Cizelj-Zivkovic v Novak Novakovic | 1-6,1-6 | |
| ITF M25 Kursumlijska Banja | 06/05 15:10 | 44 | Marko Andrejic v Stefan Cizelj-Zivkovic | 3-6,3-6 | |
| ITF M25 Kursumlijska Banja | 06/04 13:00 | 44 | Charles Dossetter v Stefan Cizelj-Zivkovic | 2-6,0-6 | |
| ITF M15 Kursumlijska Banja | 05/30 12:30 | 25 | Nikita Mashtakov v Stefan Cizelj-Zivkovic | 6-1,6-1 | |
| ITF M15 Kursumlijska Banja | 05/24 07:00 | 25 | Andrea Picchione v Stefan Cizelj-Zivkovic | 6-3,6-1 | |
| ITF M15 Telde | 04/09 09:00 | 54 | Stefan Cizelj-Zivkovic v Vicente O Moratalla | 3-6,3-6 | |
| ITF 15 Antalya | 03/05 06:30 | 62 | Rimpei Kawakami v Stefan Cizelj-Zivkovic | 6-0,6-1 | |
| ITF 15 Antalya | 02/26 07:00 | 62 | Artem Cherepin v Stefan Cizelj-Zivkovic | 3-6,6-2,10-4 | |
| ITF M25 Antalya | 02/05 07:00 | 62 | Lorenzo Joaquin Rodriguez v Stefan Cizelj-Zivkovic | 7-5,6-2 | |
| ITF M25 Antalya | 01/29 07:30 | 62 | Stefan Cizelj-Zivkovic v Emir Sutekin | 3-6,0-6 | |
| ITF 15 Antalya | 11/21 06:30 | 62 | Stefan Cizelj-Zivkovic v Michel Hopp | 6-4,4-6,3-10 |