Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/04/13 08:30 | Sho Shimabukuro v Robert Strombachs | 6-3,6-2 |
| ITF - M15 Monastir | 2021/04/09 08:30 | Antoine Escoffier v Robert Strombachs | 6-1,6-4 |
| ITF - M15 Monastir | 2021/04/08 09:50 | Buvaysar Gadamauri v Robert Strombachs | 1-6,2-6 |
| ITF - M15 Monastir | 2021/04/07 10:10 | Robert Strombachs v Alexander Shevchenko | 1-6,6-3,7-5 |
| ITF M25 Biel | 2021/03/29 08:00 | Staeheli, Luca v Robert Strombachs | 6-4,6-3 |
| ITF - M15 Poitiers | 2021/03/16 09:30 | Jaimee Floyd Angele v Robert Strombachs | 6-4,6-4 |
| Challenger Biella | 2021/03/07 11:30 | Bachinger, Matthias v Robert Strombachs | 6-2,7-5 |
| ITF - M15 Sharm El Sheikh | 2021/02/27 07:30 | Robert Strombachs v Podzus, Martins | 3-6,3-6 |
| Challenger Salinas 2 | 2021/04/26 18:00 | Alvarez, Nicolas v Yusuke Takahashi | 7-6,6-0 |
| Challenger Salinas | 2021/04/19 14:30 | Facundo Diaz Acosta v Yusuke Takahashi | 6-2,6-2 |
| Challenger Salinas | 2021/04/18 16:55 | Brymer, Gage v Yusuke Takahashi | 4-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/17 09:05 | Lucas Miedler v Yusuke Takahashi | 6-4,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/03/10 07:30 | Yusuke Takahashi v Aldin Setkic | 3-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/04 09:05 | Nick Hardt v Yusuke Takahashi | 6-3,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/03/03 14:10 | Li, Hanwen v Yusuke Takahashi | 6-4,2-6,6-7 |
| ITF - M15 Sharm El Sheikh | 2021/02/25 09:00 | Yusuke Takahashi v Jakub Paul | 3-6,2-6 |