Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Biella | 2023/07/04 16:45 | Joao Eduardo Schiessl v Ryusuke Horiuchi | 6-0,6-3 |
| ITF M25 Biella | 2023/07/03 07:00 | Ryusuke Horiuchi v Gianluca Cadenasso | 5-7,7-6,12-10 |
| ITF M15 Wroclaw | 2023/06/26 09:00 | Alex Bancila v Ryusuke Horiuchi | 6-0,6-2 |
| ITF M25 Mungia | 2023/06/19 09:55 | Ryusuke Horiuchi v Alejandro Garcia | 1-6,2-6 |
| ITF M25 Mungia | 2023/06/18 08:00 | Ryusuke Horiuchi v Keanu Elias Immler | 1-6,6-1,10-3 |
| ITF M15 Karuizawa | 2023/05/28 01:15 | Ryusuke Horiuchi v Toru Horie | 2-6,4-6 |
| ITF M15 Antalya | 2023/03/05 06:30 | Joao Eduardo Schiessl v Ryusuke Horiuchi | 6-0,6-1 |
| ITF M25 Antalya | 2022/11/07 14:15 | Igor Trunov v Ryusuke Horiuchi | 6-3,6-2 |
| ITF M25 Grasse | 2023/06/12 07:30 | Pablo Trochu v Leon Formella | 6-1,6-0 |
| ITF M25 Grasse | 2023/06/11 10:25 | Leon Formella v Laurent Julia Calac | 6-3,7-5 |
| ITF M25 Jablonec Nad Nisou | 2023/05/28 09:00 | Leon Formella v Jiri Jenicek | 2-6,3-6 |
| ITF M25 Most | 2023/05/22 08:00 | Michael Agwi v Leon Formella | 6-2,6-0 |
| ITF M25 Most | 2023/05/21 08:00 | Leon Formella v Artem Mazur | 6-3,6-2 |
| ITF M15 Krsko | 2023/05/15 12:30 | Federico Campana v Leon Formella | 6-2,6-0 |
| ITF M15 Osijek | 2023/04/30 09:30 | Leon Formella v Nik Mikovic | 6-2,3-6,3-10 |
| ITF M15 Meerbusch | 2023/04/24 13:30 | Leon Formella v Michael Agwi | 5-7,2-6 |