Stadium: Court 8 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2023/02/20 10:25 | Simon Freund v Ruben Hartig | 6-4,6-4 |
| ITF M15 Monastir | 2023/01/23 08:00 | Lukas Palovic v Ruben Hartig | 6-2,6-3 |
| ITF M15 Monastir | 2023/01/16 14:10 | Vladislav Ivanov v Ruben Hartig | 6-3,6-3 |
| ITF M15 Monastir | 2023/01/16 08:30 | Ruben Hartig v Alessandro Ragazzi | 6-3,6-3 |
| ITF M15 Monastir | 2023/01/15 17:30 | Rishabdev Raman v Ruben Hartig | 3-6,1-6 |
| ITF M15 Heraklion | 2022/10/30 10:00 | Shunsuke Wakita v Ruben Hartig | 6-2,6-2 |
| ITF M15 Heraklion | 2022/10/24 08:00 | Jonas Trinker v Ruben Hartig | 7-6,6-2 |
| ITF M15 Heraklion | 2022/10/23 10:00 | Kyran Magimay v Ruben Hartig | 5-7,3-6 |
| ITF M15 Monastir | 2023/02/20 08:30 | Hikaru Shiraishi v Niccolo Baroni | 6-4,0-6,5-10 |
| ITF M25 Monastir | 2023/02/13 15:30 | Mario G Fernandez v Hikaru Shiraishi | 6-0,4-6,10-7 |
| ITF M25 Monastir | 2023/02/13 11:55 | Wei-De Lin v Hikaru Shiraishi | 0-6,3-6 |
| ITF M25 Monastir | 2023/02/12 12:30 | Sushant Dabas v Hikaru Shiraishi | 1-6,1-6 |
| Challenger Kobe | 2022/11/13 06:25 | Marc Polmans v Hikaru Shiraishi | 7-5,4-6,6-0 |
| Challenger Yokohama | 2022/10/31 03:55 | Hikaru Shiraishi v Jonathan Mridha | 6-4,2-6,5-7 |
| Challenger Yokohama | 2022/10/30 04:55 | Makoto Ochi v Hikaru Shiraishi | 1-6,6-4,5-7 |
| ITF M15 Seremban | 2022/07/20 02:50 | Ryuki Matsuda v Hikaru Shiraishi | 4-6,0-6 |