Stadion: Court 12 Round: 62
| ITF - M15 - Platja D'Aro | 2021/10/03 08:00 | Zhenxiong Dong v Stefan Cizelj-Zivkovic | 4-6,4-6 |
| ITF - M15 - Kairo | 2021/09/12 08:00 | Andrei Cuceu v Stefan Cizelj-Zivkovic | 6-4,6-3 |
| ITF - M15 - Kairo | 2021/09/05 08:30 | Lucio Carnevalle v Stefan Cizelj-Zivkovic | 6-3,6-2 |
| ITF - M25 - Velenje | 2021/07/05 12:15 | Stefan Cizelj-Zivkovic v Lukas Palovic | 3-6,1-6 |
| ITF - M25 - Velenje | 2021/07/04 07:30 | Stefan Cizelj-Zivkovic v Marco Mania | 7-6,6-0 |
| ITF - M15 - Tbilisi | 2021/05/17 05:30 | Aleksandr Braynin v Stefan Cizelj-Zivkovic | 6-4,6-3 |
| ITF - M15 - Kairo | 2021/04/18 07:00 | Rimpei Kawakami v Stefan Cizelj-Zivkovic | 6-2,6-2 |
| ITF - M15 - Kairo | 2021/04/11 08:00 | Stefan Cizelj-Zivkovic v Andrea Gola | 1-6,2-6 |
| ITF - M15 - Platja D'Aro | 2021/10/04 11:00 | Jorge Martinez Martinez v Kirill Mishkin | 6-1,6-2 |
| ITF - M15 - Platja D'Aro | 2021/10/03 11:00 | Jorge Martinez Martinez v Ivan Kazakov | 6-7,6-3,10-2 |
| ITF - M15 - Xativa | 2021/08/03 07:00 | Jorge Martinez Martinez v Yeray A. Pastor | 6-4,2-6,10-8 |
| ITF - M15 - Xativa | 2021/08/02 07:00 | Rafael Mazon-Hernandez v Jorge Martinez Martinez | 1-6,1-6 |
| ITF - M25 - Denia | 2021/07/25 09:30 | Jorge Martinez Martinez v Alejandro Garcia | 6-0,1-6,7-10 |
| UTR Pro Tennis Series - Barcelona | 2021/06/12 07:00 | Alexandre Reco v Jorge Martinez Martinez | 6-1,5-2 |
| UTR Pro Tennis Series - Barcelona | 2021/06/11 09:30 | Jorge Martinez Martinez v David Redondo | 6-1,6-1 |
| UTR Pro Tennis Series - Barcelona | 2021/06/09 09:30 | Jorge Martinez Martinez v Antoine Escoffier | 2-6,5-6 |