Stadium: Court 8 Round: 62 Ground: Clay
| ITF M15 Skopje | 2021/05/30 09:30 | Ondrej Horak v Viktor Jovic | 4-6,3-6 |
| ITF M25 Most | 2021/05/23 14:00 | Martin Damm v Ondrej Horak | 7-5,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Ondrej Horak v Tomas Papik | 1-6,4-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 08:30 | George Loffhagen v Ondrej Horak | 5-7,1-6 |
| ITF M25 Prague | 2021/05/10 08:00 | Jan Satral v Ondrej Horak | 6-1,6-2 |
| ITF M25 Prague | 2021/05/09 10:00 | Ondrej Horak v Jan Jermar | 7-6,6-3 |
| ITF M15 Sibenik | 2021/04/20 08:00 | Alen Rogic-Hadzalic v Ondrej Horak | 6-1,6-4 |
| ITF M15 Sibenik | 2021/04/19 12:15 | Ondrej Horak v Boris Butulija | 6-2,7-6 |
| ITF M15 Skopje | 2021/06/01 08:00 | Luigi Sorrentino v Oscar Moraing | 6-1,3-6,5-10 |
| ITF M15 Skopje | 2021/05/31 11:00 | Luigi Sorrentino v Aleksa Mardjonovic | 6-0,6-4 |
| ITF M15 Skopje | 2021/05/30 14:00 | Luigi Sorrentino v Matija Zugic | 6-1,6-3 |
| ITF M15 Jerusalem | 2021/05/10 07:00 | Luigi Sorrentino v Sahar Simon | 1-6,2-6 |
| 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 10:00 | Asaf Friedler v Luigi Sorrentino | 4-6,3-6 |
| ITF M15 Cairo | 2021/04/22 09:25 | Oliver Crawford v Luigi Sorrentino | 7-5,6-2 |
| ITF M15 Cairo | 2021/04/21 10:05 | Fares Zakaria v Luigi Sorrentino | 2-6,3-6 |