Stadium: Court 2 Round: 62 Ground: Clay
| ITF M15 Buschhausen | 2023/09/10 11:00 | Jurriaan Bol v Leon Formella | 6-4,3-6,12-10 |
| ITF M15 Haren | 2023/09/03 08:00 | Sam Bakker v Leon Formella | 6-4,6-4 |
| ITF M25 Oldenzaal | 2023/08/29 11:45 | Adam Panaras v Leon Formella | 2-6,6-4,10-7 |
| ITF M25 Oldenzaal | 2023/08/28 16:20 | Marcel Hornung v Leon Formella | 2-6,3-6 |
| ITF M15 Huy | 2023/08/21 11:45 | Thiemo De Bakker v Leon Formella | 6-3,6-0 |
| ITF M15 Huy | 2023/08/20 08:00 | Leon Formella v Austin Johnson | 7-5,6-4 |
| ITF M25 Muttenz | 2023/08/14 10:10 | Leon Formella v Giuseppe La Vela | 4-6,3-6 |
| ITF M15 Eupen | 2023/08/08 08:00 | Stijn Slump v Leon Formella | 6-4,6-2 |
| ITF M25 Jablonec Nad Nisou | 2023/08/27 12:00 | Jan Facek v Filip Vacula | 3-6,1-6 |
| Challenger Prague | 2023/08/20 08:00 | Adria Soriano Barrera v Jan Facek | 6-4,6-1 |