Stadium: Court 8 Round: 26 Ground: Clay
| ITF Croatia F1 | 2018/03/09 10:50 | Admir Kalender v Alexandar Lazarov | 2-6,4-6 |
| ITF M15 Jerusalem | 2021/05/14 07:30 | Alexandar Lazarov v Felix Corwin | 2-6,7-5,6-3 |
| ITF M15 Jerusalem | 2021/05/13 08:25 | Alexandar Lazarov v Reese Stalder | 6-3,3-6,6-3 |
| ITF M15 Jerusalem | 2021/05/11 06:30 | Alexandar Lazarov v Samer Al Tori | 6-3,6-1 |
| ITF M15 Ramat Hasharon | 2021/05/07 07:00 | Alexandar Lazarov v Yshai Oliel | 4-6,3-6 |
| ITF M15 Ramat Hasharon | 2021/05/06 08:50 | Alexandar Lazarov v Luigi Sorrentino | 7-5,6-1 |
| ITF M15 Ramat Hasharon | 2021/05/05 10:40 | Alexandar Lazarov v Toby D. Boyer | 6-0,6-1 |
| ITF M15 Opatija | 2021/03/23 12:30 | Alexandar Lazarov v Sebastian Prechtel | 6-7,4-6 |
| ITF M15 Rovinj | 2021/03/18 10:10 | Martin Damm v Alexandar Lazarov | 6-1,5-7,6-4 |
| ITF M15 Sibenik | 2021/05/17 10:25 | Duje Kekez v Admir Kalender | 6-4,0-6,10-8 |
| ITF M15 Sibenik | 2021/05/16 10:00 | Caspar Schuetze v Admir Kalender | 3-6,1-6 |
| ITF M15 Sibenik | 2021/04/19 10:10 | Admir Kalender v Alexis Boureau | 4-6,4-6 |
| ITF M15 Opatija | 2021/03/23 12:30 | Admir Kalender v Davide Galoppini | 2-6,0-6 |
| ITF M15 Rovinj | 2021/03/17 10:00 | Pietro Rondoni v Admir Kalender | 7-5,6-4 |
| ITF M15 Porec | 2021/03/10 10:20 | Admir Kalender v Pavel Nejedly | 2-6,1-6 |
| ITF M15 Antalya | 2021/02/03 06:30 | Admir Kalender v Gabriele Maria Noce | 3-6,7-6,8-10 |
| ITF M15 Antalya | 2021/02/02 10:00 | Alexander Weis v Admir Kalender | 3-6,6-7 |