Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Jerusalem | 2021/05/11 06:30 | Keenan Mayo v Yeshaya, Omer | 7-6,6-4 |
| ITF M15 Jerusalem | 2021/05/10 11:00 | Keenan Mayo v Ron Ellouck | 6-1,1-6,10-7 |
| ITF M15 Jerusalem | 2021/05/09 08:30 | Keenan Mayo v Mark Neyelov | 6-1,6-1 |
| ITF M15 Ramat Hasharon | 2021/05/03 07:00 | Keenan Mayo v Christophe Clement | 3-6,3-6 |
| ITF M15 Ramat Hasharon | 2021/05/02 07:00 | Keenan Mayo v Tom Saporta | 6-3,6-3 |
| UTR Pro Tennis Series California | 2021/02/21 16:00 | Keenan Mayo v Spencer Johnson | 2-6,6-3,6-4 |
| UTR Pro Tennis Series California | 2021/02/20 17:30 | Maier, Jonas v Keenan Mayo | 5-7,0-0 |
| UTR Pro Tennis Series California | 2021/02/18 17:30 | Keenan Mayo v Aidan Mayo | 7-5,3-6,5-7 |
| ITF M15 Ramat Hasharon | 2021/05/07 08:50 | Edan Leshem v Cozbinov, Alexander | 6-2,3-6,6-3 |
| ITF M15 Ramat Hasharon | 2021/05/06 07:00 | Dominik Palan v Cozbinov, Alexander | 6-4,6-7,6-7 |
| ITF M15 Ramat Hasharon | 2021/05/04 07:00 | Ginat, Roi v Cozbinov, Alexander | 1-6,3-6 |
| ITF M15 St Petersburg | 2021/04/14 07:00 | Yanki Erel v Cozbinov, Alexander | 7-6,7-6 |
| ITF M15 St Petersburg | 2021/04/10 08:00 | Cozbinov, Alexander v Nedelko, Ivan | 6-2,4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Cozbinov, Alexander v Dubrivnyy, Artem | 6-4,6-7,6-3 |
| ITF M15 St Petersburg | 2021/04/08 09:00 | Tyurnev, Evgeny v Cozbinov, Alexander | 6-2,3-6,2-6 |
| ITF M15 St Petersburg | 2021/04/07 08:30 | Cozbinov, Alexander v Boris Pokotilov | 6-0,6-0 |