Stadium: Court 7 Round: 54 Ground: Clay
| ITF M15 Frederiksberg | 2021/08/01 10:00 | Leonardo Catani v Marcel Marlon Sudzum | 7-6,6-2 |
| ITF M15 Vejle | 2021/07/27 17:20 | Leonardo Catani v Henrik Heise Korsgaard | 3-6,3-6 |
| ITF M15 Vejle | 2021/07/26 14:40 | Yannik Steinegger v Leonardo Catani | 5-7,6-2,10-4 |
| ITF M15 Vejle | 2021/07/25 11:00 | Pietro Schiavetti v Leonardo Catani | 2-6,0-6 |
| ITF M15 Perugia | 2021/07/18 11:30 | Leonardo Catani v Federico Bertuccioli | 4-6,2-6 |
| ITF M15 Gaiba | 2021/06/07 09:30 | Julien De Cuyper v Leonardo Catani | 6-3,6-3 |
| ITF M15 Cairo | 2021/05/04 07:55 | Rimpei Kawakami v Leonardo Catani | 7-5,6-0 |
| ITF M15 Cairo | 2021/05/03 12:30 | Leonardo Catani v Luka Petrovic | 7-6,1-6,10-3 |
| UTR Pro Tennis Series Beograd | 2021/07/11 07:00 | Yanais Laurent v Nikola Slavic | 3-6,4-5 |
| UTR Pro Tennis Series Beograd | 2021/07/10 08:30 | Giacomo Revelli v Nikola Slavic | 2-6,4-5 |
| UTR Pro Tennis Series Beograd | 2021/07/08 09:00 | Nikola Slavic v Olexiy Kolisnyk | 1-6,4-6 |
| UTR Pro Tennis Series Beograd | 2021/07/07 10:30 | Nikola Slavic v Constant De La Bassetiere | 6-4,5-4 |
| UTR Pro Tennis Series Beograd | 2021/07/06 14:00 | Nikola Slavic v Michalis Sakellaridis | 6-3,6-6 |
| UTR Pro Tennis Series Beograd | 2021/07/05 07:30 | Nikola Slavic v Dusan Obradovic | 6-7,6-7 |
| ITF M25 Belgrade | 2021/06/30 08:45 | Nikola Slavic v Akira Santillan | 1-6,1-6 |
| ITF M25 Belgrade | 2021/06/29 09:00 | George Botezan v Nikola Slavic | 4-6,2-6 |