Stadium: Court 21 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/10/17 07:00 | Simon Sedliak v Mert Arabaci | 6-4,6-1 |
| ITF M15 Antalya | 2021/10/10 07:00 | Simon Sedliak v Hasan Ibrahim | 1-6,2-6 |
| ITF M25 Budapest | 2021/09/26 07:00 | Simon Sedliak v Eric Morris | 1-6,6-3,4-10 |
| ITF M15 Zilina | 2021/08/30 07:30 | Paul Valsecchi v Simon Sedliak | 7-5,7-5 |
| ITF M15 Bratislava | 2021/08/23 09:00 | Kristof Minarik v Simon Sedliak | 6-2,6-0 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 11:05 | Piotr Matuszewski v Simon Sedliak | 2-6,6-4,10-4 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 13:55 | Simon Sedliak v Peter Samosi | 6-2,7-5 |
| ITF M15 Poprad | 2021/07/04 11:00 | Dominik Palan v Simon Sedliak | 6-3,6-1 |
| ITF M15 Antalya | 2021/10/17 08:00 | Jason Janis v Lukas H Lilleengen | 1-6,1-6 |
| ITF M15 Antalya | 2021/10/13 09:00 | Lukas H Lilleengen v Kristof Minarik | 2-6,6-4,6-1 |
| ITF M15 Antalya | 2021/10/12 07:00 | Lukas H Lilleengen v John Sperle | 3-6,6-3,10-8 |
| ITF M15 Antalya | 2021/10/11 09:00 | Lukas H Lilleengen v Gonzalo Zeitune | 6-4,6-0 |
| ITF M15 Cairo | 2021/09/21 08:00 | Giovanni Calvano v Lukas H Lilleengen | 6-2,6-1 |
| ITF M15 Cairo | 2021/09/20 08:00 | Julian Gimenez v Lukas H Lilleengen | 1-6,4-6 |
| ITF M15 Cairo | 2021/09/19 08:30 | Lakshya Gupta v Lukas H Lilleengen | 0-6,4-6 |
| ITF M15 Cairo | 2021/09/13 07:00 | Gabriel Roveri Sidney v Lukas H Lilleengen | 6-3,6-7,10-8 |