| UTR Pro Tennis Series - Zadar | 2021/06/28 12:30 | Warren Sinius v Josip Krstanovic | 2-6,1-5 |
| ITF - M15 - Sibenik | 2021/04/19 10:00 | Mehdi Sadaoui v Josip Krstanovic | 7-6,6-4 |
| ITF - M15 - Sibenik | 2021/04/18 10:00 | Josip Krstanovic v Pavle Daljev | 6-4,6-3 |
| ITF - M15 - Opatija | 2021/03/21 11:00 | Oleksandr Ovcharenko v Josip Krstanovic | 6-4,6-0 |
| ITF - M15 - Rovinj | 2021/03/15 11:00 | Josip Krstanovic v Federico Arnaboldi | 1-6,2-6 |
| ITF - M15 - Rovinj | 2021/03/14 08:30 | Josip Krstanovic v Mattia Frinzi | 6-2,7-6 |
| ITF - M15 - Porec | 2021/03/07 12:00 | Damien Wenger v Josip Krstanovic | 7-6,6-0 |
| ITF - M15 - Antalya | 2021/02/21 13:00 | Josip Krstanovic v Calin Manda | 2-6,3-6 |
| UTR Pro Tennis Series - Barcelona | 2021/06/26 12:00 | Constant De La Bassetiere v Adria Soriano Barrera | 6-2,3-6,1-6 |
| UTR Pro Tennis Series - Barcelona | 2021/06/25 09:30 | Constant De La Bassetiere v Jose Joaquin M Cisneros | 4-1 |
| UTR Pro Tennis Series - Barcelona | 2021/06/23 08:00 | Constant De La Bassetiere v Mario Mansilla Diez | 6-1,5-1 |
| UTR Pro Tennis Series - Barcelona | 2021/06/22 08:00 | Constant De La Bassetiere v Alvaro Bueno Gil | 6-4,6-4 |
| UTR Pro Tennis Series - Barcelona | 2021/06/20 07:00 | Constant De La Bassetiere v Marcelo Zormann | 6-7,1-5 |
| ITF - M15 - Antalya | 2021/06/08 07:00 | Constant De La Bassetiere v Hasan Ibrahim | 4-6,6-3,9-11 |
| ITF - M15 - Antalya | 2021/06/07 09:55 | Vitali Shvets v Constant De La Bassetiere | 3-6,0-6 |
| ITF - M15 - Antalya | 2021/05/30 07:30 | Lorenzo Joaquin Rodriguez v Constant De La Bassetiere | 6-1,7-5 |