Stadium: Court 4 Round: 62 Ground: Clay
| ITF M25 Belgrade | 2021/06/27 12:00 | Martin Zeljenka v George Gregoriou | 6-1,6-1 |
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |
| ITF M15 Sibenik | 2021/05/16 07:30 | Joris Hoogland v Martin Zeljenka | 6-7,3-6 |
| ITF M15 Prijedor | 2021/05/09 09:30 | Kristian Juhas v Martin Zeljenka | 6-1,6-1 |
| ITF M15 Sibenik | 2021/04/19 12:20 | Gorazd Srbljak v Martin Zeljenka | 6-0,6-2 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Martin Zeljenka v Anze Arh | 7-5,1-6,10-3 |
| ITF M15 Szekesfehervar | 2019/09/01 10:30 | Martin Zeljenka v Tomas Liska | 4-6,2-6 |
| ITF M25 Gyor | 2019/08/25 09:00 | Martin Zeljenka v Mate Voros | 3-6,6-7 |
| ITF M15 Genova | 2021/06/14 07:00 | Giorgio Tabacco v Andrea Guerrieri | 6-3,3-6,6-10 |
| ITF M15 Antalya | 2021/06/08 10:05 | Pawel Juszczak v Giorgio Tabacco | 6-7,6-2,10-2 |
| ITF M15 Antalya | 2021/06/06 07:30 | Danylo Veremeychuk v Giorgio Tabacco | 1-6,3-6 |
| ITF M15 Antalya | 2021/06/01 07:00 | Giorgio Tabacco v Michalis Sakellaridis | 6-0,4-6,7-10 |
| ITF M15 Antalya | 2021/05/31 09:30 | Timo Stodder v Giorgio Tabacco | 4-6,5-7 |
| ITF M15 Antalya | 2021/05/30 07:30 | Aleksandr Lobanov v Giorgio Tabacco | 2-6,4-6 |
| ITF M15 Antalya | 2021/05/26 12:00 | Giorgio Tabacco v Lucas Gerch | 2-6,3-6 |
| ITF M15 Antalya | 2021/05/25 07:00 | Giorgio Tabacco v Danylo Veremeychuk | 6-3,6-0 |