| UTR Pro London | 2023/05/19 10:40 | Luke Simkiss v Stefan Cooper | 6-7,4-6 |
| UTR Pro London | 2023/05/18 07:00 | Sklenka, Victor v Stefan Cooper | 3-6,6-1,5-6 |
| UTR Pro London | 2023/05/16 07:00 | Capalbo, Franco v Stefan Cooper | 4-6,6-1,6-4 |
| UTR Pro London | 2023/05/15 10:00 | Stefan Cooper v Ivan Denisov | 2-6,4-6 |
| UTR Pro Easton | 2023/04/07 11:30 | Stefan Cooper v Kyle Rae | 6-7,6-6 |
| UTR Pro Easton | 2023/04/06 07:00 | Marshall Tutu v Stefan Cooper | 3-6,7-5,6-3 |
| UTR Pro Easton | 2023/04/05 11:30 | Wai, Ching Wah v Stefan Cooper | 7-5,7-5 |
| UTR Pro Easton | 2023/04/03 12:30 | Luke Simkiss v Stefan Cooper | 6-7,5-7 |
| UTR Pro London | 2023/05/19 08:30 | Onuma, Yujiro v Petrovic, Luka | 2-6,3-6 |
| UTR Pro London | 2023/05/17 07:00 | Onuma, Yujiro v Anthony Weingarten | 6-1,6-1 |
| UTR Pro London | 2023/05/16 08:30 | Onuma, Yujiro v Janos Fekete | 3-6,3-6 |
| UTR Pro London | 2023/05/15 07:00 | Ed Pudney v Onuma, Yujiro | 4-6,0-6 |
| ITF - M25 Nottingham | 2023/05/01 10:50 | Onuma, Yujiro v Freddy Blaydes | 0-6,4-6 |
| ITF - M25 Nottingham - Qualif. | 2023/04/30 10:05 | Ying Hou v Onuma, Yujiro | 3-6,1-6 |
| ITF - M25 Nottingham | 2023/04/25 09:00 | Onuma, Yujiro v Luke Simkiss | 3-6,4-6 |
| ITF - M25 Nottingham - Qualif. | 2023/04/24 13:10 | Sean Hodkin v Onuma, Yujiro | 2-6,6-0,2-10 |