Stadium: Court 2 Round: 25 Ground: Clay
| ITF - M25 Hammamet | 2024/04/08 14:25 | Seita Watanabe v Hong-Lin Fu | 1-6,4-6 |
| ITF - M25 Hammamet | 2024/04/08 08:30 | Seita Watanabe v Marc Ros Mesas | 6-2,6-3 |
| ITF - M25 Hammamet | 2024/04/02 09:00 | Noah Perfetti v Seita Watanabe | 4-6,6-2,7-5 |
| Challenger - Kigali | 2024/03/04 10:20 | Florent Bax v Seita Watanabe | 6-1,6-4 |
| Challenger - Kigali | 2024/03/03 11:35 | Sai K R Ganta v Seita Watanabe | 4-6,2-6 |
| Challenger - Kigali | 2024/02/26 08:00 | Seita Watanabe v Ivan Denisov | 4-6,7-6,4-6 |
| Challenger - Kigali | 2024/02/25 10:15 | Seita Watanabe v Ren Nakamura | 6-1,6-4 |
| Challenger - Burnie | 2024/02/05 00:45 | Yuki Mochizuki v Seita Watanabe | 6-3,6-3 |
| ITF - M25 Hammamet | 2024/04/08 13:15 | Johan Nikles v Matteo Fondriest | 6-3,6-3 |
| Challenger - Barletta | 2024/03/31 10:20 | Matthew Dellavedova v Johan Nikles | 6-1,7-5 |
| Challenger - Zadar | 2024/03/18 09:00 | Johan Nikles v Arthur Gea | 1-6,4-6 |
| ITF - M15 Rovinj | 2024/03/12 12:05 | Johan Nikles v Stefan Popovic | 6-3,3-6,2-6 |
| Challenger - Lugano | 2024/03/05 17:15 | Cem Ilkel v Johan Nikles | 6-0,6-3 |
| ITF - M25 Hammamet | 2024/02/21 13:30 | Johan Nikles v Gabriele Maria Noce | 6-4,1-6,3-6 |
| ITF - M25 Hammamet | 2024/02/20 09:15 | Johan Nikles v Ivan Kazakov | 7-5,6-4 |
| ITF - M25 Hammamet | 2024/02/19 11:00 | Johan Nikles v Giammarco Gandolfi | 6-0,3-6,10-3 |