Stadium: Court 10 Round: 26 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/05/31 09:00 | Seita Watanabe v Reinberg, Emil | 6-7,5-7 |
| ITF M15 Cancun | 2021/10/06 15:30 | Lopez Villasenor, Gerardo v Reinberg, Emil | 7-6,1-6,2-6 |
| ITF M15 Cancun | 2021/10/05 14:00 | Reinberg, Emil v Luis Britto | 7-5,6-1 |
| ITF M15 Cancun | 2021/10/04 16:30 | Joao Victor C Loureiro v Reinberg, Emil | 7-6,4-6,6-10 |
| ITF M15 Cancun | 2021/10/03 19:45 | Reinberg, Emil v Gabriel Roveri Sidney | 7-6,7-5 |
| ITF M15 Cancun | 2021/10/01 18:30 | Federico Agustin Gomez v Reinberg, Emil | 7-5,6-3 |
| ITF M15 Cancun | 2021/09/30 14:30 | Joshua Sheehy v Reinberg, Emil | 2-6,6-4,3-6 |
| ITF M15 Cancun | 2021/09/28 14:00 | Reinberg, Emil v Matt Kuhar | 6-3,2-6,10-5 |
| ITF M15 Cancun | 2021/09/27 14:30 | Reinberg, Emil v Luca Moro Almeida | 6-0,6-0 |
| ITF M15 Cancun | 2021/10/06 17:15 | Siddhant Banthia v Seita Watanabe | 3-6,1-6 |
| ITF M15 Cancun | 2021/10/05 14:00 | Seita Watanabe v Julian Cundom | 6-0,6-0 |
| ITF M15 Cancun | 2021/10/04 14:00 | Seita Watanabe v Enzo Frances Tessari | 6-0,6-0 |
| ITF M15 Cancun | 2021/10/03 15:30 | Seita Watanabe v Zuniga Cantillana, Fernando Andres | 6-2,6-0 |
| ITF M15 Cancun | 2021/09/30 14:30 | Christian Langmo v Seita Watanabe | 6-2,6-4 |
| ITF M15 Cancun | 2021/09/28 17:00 | Mendoza, Alejandro v Seita Watanabe | 6-7,0-6 |
| ITF M15 Cancun | 2021/09/21 14:00 | Seita Watanabe v Telles, Leonardo | 3-6,6-4,5-7 |
| ITF M15 Cairo | 2021/09/09 08:00 | Seita Watanabe v Mora, Maxime | 5-7,2-6 |