Stadium: Centre Court Round: 25 Ground: Clay
| Challenger Prague | 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 Prague | 2021/05/12 07:30 | Mischa Zverev v Peter Goldsteiner | 7-6,5-7,6-1 |
| ATP Munich | 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 |
| Challenger Oeiras | 2021/04/08 13:00 | Mischa Zverev v Tiago Cacao | 3-6,6-1,6-7 |
| Challenger San Marino | 2021/08/10 14:45 | Julien Cagnina v Holger Rune | 3-6,4-6 |
| ITF M25 Vic | 2021/05/16 08:00 | Julien Cagnina v Max Alcala Gurri | 6-7,7-6,1-10 |
| ITF M25 Reus | 2021/04/13 07:30 | Imanol L Morillo v Julien Cagnina | 6-4,3-6,10-1 |
| ITF M25 Reus | 2021/04/12 07:30 | Ilya Rudiukov v Julien Cagnina | 3-6,0-6 |
| ITF M25 Reus | 2021/04/11 10:00 | Pol Amoros Ramos v Julien Cagnina | 0-6,0-6 |
| ITF M15 Antalya | 2021/03/10 10:05 | Julien Cagnina v Oleksii Krutykh | 6-1,1-6,3-6 |
| ITF M15 Antalya | 2021/03/09 07:00 | Julien Cagnina v Andrea Picchione | 6-3,7-6 |
| ITF M15 Antalya | 2021/03/08 09:00 | Julien Cagnina v Dian Nedev | 7-6,6-1 |