Stadium: Court 6 Round: 25 Ground: Clay
| ATP - Munich | 2021/04/24 11:00 | Zverev, Mischa v Daniel Elahi Galan | 3-6,3-6 |
| ATP - Monte-Carlo | 2021/04/10 10:20 | Zverev, Mischa v Londero, Juan Ignacio | 4-6,1-6 |
| Challenger - Oeiras | 2021/04/08 13:00 | Zverev, Mischa v Cacao, Tiago | 3-6,6-1,6-7 |
| ATP - Miami | 2021/03/24 18:55 | James Duckworth v Zverev, Mischa | 6-2,4-6,6-4 |
| ATP - Miami | 2021/03/23 18:10 | Viola, Matteo v Zverev, Mischa | 7-6,4-6,1-6 |
| ATP - Miami | 2021/03/22 19:15 | Zverev, Mischa v Petrovic, Danilo | 7-6,6-2 |
| ATP - Acapulco | 2021/03/14 01:40 | Joao Sousa v Zverev, Mischa | 7-5,5-7,7-5 |
| ITF - M25 Faro | 2021/03/05 12:00 | Zverev, Mischa v Neuchrist, Maximilian | 4-6,6-2,7-6 |
| ITF M25 Prague | 2021/05/11 09:15 | Renta Tokuda v Goldsteiner, Peter | 3-6,4-6 |
| ITF M25 Prague | 2021/05/10 08:00 | Goldsteiner, Peter v Aidan Mchugh | 5-7,7-5,11-9 |
| ITF M25 Prague | 2021/05/09 11:00 | Krystof Zapsky v Goldsteiner, Peter | 3-6,4-6 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/21 11:20 | Aldin Setkic v Goldsteiner, Peter | 6-2,6-4 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/20 08:00 | Goldsteiner, Peter v Luigi Castelletti | 7-5,1-6,12-10 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/19 07:55 | Goldsteiner, Peter v Lovre Erceg | 6-1,6-0 |
| ITF - M15 Opatija | 2021/03/23 09:00 | Dambrosi, Giacomo v Goldsteiner, Peter | 6-3,6-2 |
| ITF - M15 Opatija | 2021/03/22 08:00 | Voros, Mate v Goldsteiner, Peter | 2-6,5-7 |