stadio: Court 3 Round: 14 Ground: Hardcourt indoor
| Challenger Luedenscheid | 2021/08/17 14:45 | Mischa Zverev v Julien Cagnina | 3-6,1-6 |
| Challenger Praga | 2021/08/09 15:30 | Riccardo Bonadio v Mischa Zverev | 6-3,2-6,6-3 |
| Challenger Braunschweig | 2021/07/06 15:25 | Nicola Kuhn v Mischa Zverev | 6-2,7-6 |
| Challenger Biella | 2021/05/17 08:00 | Mischa Zverev v Omar Giacalone | 6-7,2-6 |
| Challenger Biella | 2021/05/16 09:00 | Mischa Zverev v Geoffrey Blancaneaux | 6-2,6-0 |
| ITF M25 Praga | 2021/05/12 07:30 | Mischa Zverev v Peter Goldsteiner | 7-6,5-7,6-1 |
| ATP Monaco | 2021/04/24 11:00 | Mischa Zverev v Daniel Elahi Galan | 3-6,3-6 |
| ATP Monte Carlo | 2021/04/10 10:20 | Mischa Zverev v Juan Ignacio Londero | 4-6,1-6 |
| ITF M25 Plaisir | 2021/09/15 14:05 | Jurgen Briand v Tobias Simon | 6-4,7-6 |
| Challenger Tulln | 2021/09/06 10:25 | Uladzimir Ignatik v Tobias Simon | 6-4,4-6,7-5 |
| Challenger Tulln | 2021/09/05 13:00 | Rafael Matos v Tobias Simon | 6-7,2-6 |
| ITF M25 Caslano | 2021/08/26 14:30 | Giovanni Oradini v Tobias Simon | 4-6,6-4,3-6 |
| ITF M25 Caslano | 2021/08/25 13:10 | Stefano Baldoni v Tobias Simon | 6-7,1-6 |
| ITF M25 Francoforte sul Meno | 2021/08/10 13:55 | Tobias Simon v Christian Sigsgaard | 3-6,3-6 |
| ITF M25 Bakio | 2021/06/29 13:00 | Pablo Llamas Ruiz v Tobias Simon | 7-5,6-2 |
| ITF M25 Klosters | 2021/06/24 08:35 | Dominic Stephan Stricker v Tobias Simon | 7-6,6-7,6-3 |