Stadium: Court 8 Round: 54 Ground: Clay
| ITF M15 Bratislava | 2021/08/16 08:00 | Zsombor Velcz v Matej Galik | 6-0,6-2 |
| ITF M15 Telavi | 2021/08/03 09:00 | Mikhail Fufygin v Zsombor Velcz | 6-4,7-6 |
| ITF M15 Doboj | 2021/07/13 12:30 | Zsombor Velcz v Martin Krumich | 6-3,4-6,6-7 |
| ITF M15 Antalya | 2021/06/28 06:30 | Zsombor Velcz v Fletcher Scott | 5-7,1-6 |
| ITF M15 Antalya | 2021/06/23 10:15 | Stefan Palosi v Zsombor Velcz | 6-3,7-6 |
| ITF M15 Szarajevó | 2021/06/02 15:55 | Zsombor Velcz v Domagoj Biljesko | 7-6,2-6,5-7 |
| ITF M15 Kouvola | 2021/05/28 07:15 | Anton Matusevich v Zsombor Velcz | 6-1,6-3 |
| ITF M15 Kouvola | 2021/05/27 12:25 | Joao Victor C Loureiro v Zsombor Velcz | 2-6,6-4,2-6 |
| ITF M15 Bratislava | 2021/08/16 12:00 | Isa Mammetgulyyev v Lukas H Lilleengen | 3-6,1-6 |
| ITF M15 Frederiksberg | 2021/08/01 08:00 | Lukas H Lilleengen v Facundo Yunis | 6-3,1-6,5-10 |
| ITF M15 Vejle | 2021/07/25 07:00 | Lukas H Lilleengen v Carl Emil Overbeck | 2-6,6-4,7-10 |
| ITF M15 Perugia | 2021/07/18 12:45 | Lukas H Lilleengen v Mattia Frinzi | 3-6,3-6 |
| ITF M25 Montauban | 2021/06/21 13:00 | Thibault Verdier v Lukas H Lilleengen | 6-7,6-2,10-8 |
| ITF M25 Grasse | 2021/06/14 16:15 | Jurgen Briand v Lukas H Lilleengen | 6-1,7-6 |
| ITF M25 Grasse | 2021/06/14 11:40 | Lukas H Lilleengen v Pierre Delage | 7-5,7-5 |
| ITF M25 Grasse | 2021/06/13 14:55 | Alexandre Aubriot v Lukas H Lilleengen | 3-6,0-6 |