Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Oldenzaal | 2021/08/16 10:30 | George Loffhagen v Jarno Jans | 6-2,7-5 |
| ITF M15 Oldenzaal | 2021/08/15 07:30 | Jarno Jans v Paulo A S Dos Santos | 7-5,6-1 |
| ITF M25 The Hague | 2021/06/27 08:00 | Mick Veldheer v Jarno Jans | 6-4,6-1 |
| ITF M15 Monastir | 2021/10/07 11:20 | Valentin Vacherot v Kazuki Nishiwaki | 6-2,6-3 |
| ITF M15 Monastir | 2021/10/05 09:35 | Robin Bertrand v Kazuki Nishiwaki | 3-6,4-6 |
| ITF M15 Monastir | 2021/09/30 08:00 | Christoph Negritu v Kazuki Nishiwaki | 6-1,6-3 |
| ITF M15 Monastir | 2021/09/29 09:40 | Pierre Delage v Kazuki Nishiwaki | 2-6,4-6 |
| ITF M15 Monastir | 2021/09/23 08:00 | Kazuki Nishiwaki v Giovanni Oradini | 6-7,2-6 |
| ITF M15 Monastir | 2021/09/22 08:00 | Peter Bertran v Kazuki Nishiwaki | 6-1,1-6,1-6 |
| ITF M15 Monastir | 2021/08/31 08:00 | Kazuki Nishiwaki v William Griffith | 0-6,2-6 |
| ITF M15 Monastir | 2021/08/25 07:30 | Kazuki Nishiwaki v Kyle Seelig | 1-6,5-7 |