Stadium: Court 1 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Tbilisi | 2021/05/17 05:30 | Piotr Grynkowski v David Chelidze | 4-6,6-4,10-7 |
| ITF M15 Cairo | 2021/04/14 12:30 | Francesco Passaro v Piotr Grynkowski | 7-5,6-1 |
| ITF M15 Cairo | 2021/04/13 12:30 | Piotr Grynkowski v Andrea Gola | 6-3,4-6,10-2 |
| ITF M15 Bratislava | 2021/03/09 12:00 | Piotr Grynkowski v Edward Hubner | 2-6,2-6 |
| ITF M15 Bratislava | 2021/03/08 12:00 | Piotr Grynkowski v Tomas Balazi | 6-0,6-1 |
| ITF M15 Bratislava | 2021/03/03 16:55 | Piotr Grynkowski v Daniel Siniakov | 3-6,6-3,1-6 |
| ITF M15 Bratislava | 2021/03/02 09:00 | Piotr Grynkowski v Mate Voros | 6-2,6-3 |
| ITF M15 Bratislava | 2021/03/01 12:00 | Piotr Grynkowski v Jakub Katuch | 6-3,6-1 |
| ITF M15 Tbilisi | 2021/05/17 05:30 | Charles Minc v Christian Sigsgaard | 4-6,3-6 |
| ITF M15 Sibenik | 2021/04/22 08:00 | Christian Sigsgaard v David Pichler | 2-6,5-7 |
| ITF M15 Sibenik | 2021/04/21 10:30 | Ugo Blanchet v Christian Sigsgaard | 2-6,0-6 |
| ITF M15 Sibenik | 2021/04/20 08:00 | Domagoj Biljesko v Christian Sigsgaard | 6-1,6-7,4-10 |
| ITF M15 Sibenik | 2021/04/19 08:00 | Christian Sigsgaard v Neil Oberleitner | 7-6,6-4 |
| ITF M15 Sibenik | 2021/04/18 08:00 | Aleksandar Tomas v Christian Sigsgaard | 2-6,7-6,2-10 |
| ITF M15 Sharm El Sheikh | 2021/03/28 14:30 | Ivan Mikhaylyuk v Christian Sigsgaard | 4-6,6-4,10-2 |
| ITF M15 Sharm El Sheikh | 2021/03/22 07:30 | Marco Miceli v Christian Sigsgaard | 7-6,3-6,10-5 |