 Italy: M15 Perugia - Doubles - Main |
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| 1/8-finals | Frinzi M./Madaras N. | Campana F./Noce G. M. | 0:2 (2:6, 63:7) | dettagli | 20.07.2021 |
 Bulgaria: M15 Sofia - Doubles - Main |
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| Quarter-finals | Frinzi M./Sheyngezikht L. | Fenty A./Sinclair C. | 0:2 (5:7, 4:6) | dettagli | 08.07.2021 |
| 1/8-finals | Sakellaridis S./Terziev S. | Frinzi M./Sheyngezikht L. | 1:2 (6:4, 4:6, 7:10) | dettagli | 06.07.2021 |
| Italy: M15 Gaiba - Doubles - Main |
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| 1/8-finals | De Bernardis A./Frinzi M. | Castelnuovo L./Steinegger Y. | 0:2 (4:6, 2:6) | dettagli | 08.06.2021 |
 Tunisia: M15 Monastir 16 - Doubles - Main |
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| Quarter-finals | Frinzi M./Picchione A. | Ozolins K./Strombachs R. | 0:2 (2:6, 2:6) | dettagli | 06.05.2021 |
| 1/8-finals | Gutierrez O. J./Klier Junior G. | Frinzi M./Picchione A. | 0:2 (3:6, 3:6) | dettagli | 04.05.2021 |
 Croatia: M15 Opatija - Doubles - Main |
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| 1/8-finals | Ferrari G./Goldsteiner P. | Fonio G./Frinzi M. | CAN. | dettagli | 23.03.2021 |
| Croatia: M15 Porec - Doubles - Main |
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| 1/8-finals | Frinzi M./Mashtakov N. | Carou I./Otegui J. B. | 1:2 (6:4, 5:7, 6:10) | dettagli | 09.03.2021 |
| Italy: M25 Trento - Doubles - Main |
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| Quarter-finals | Bemelmans R./Masur D. | Forti F./Frinzi M. | 2:0 (7:5, 6:4) | dettagli | 26.02.2020 |
| 1/8-finals | Bertola R./Tresca G. | Forti F./Frinzi M. | 0:2 (0:6, 1:6) | dettagli | 25.02.2020 |
USA: US Open - Singles - Qualification