| Jun 26, 2026 | Tureshbayev | 1–0 | Mazzi | Round 11: Tureshbayev, Anuar - Mazzi, Leonardo | Sicilian Defense: Chekhover Variation | |
| Jun 25, 2026 | Mazzi | 0–1 | Vemparala | Round 10: Mazzi, Leonardo - Vemparala, Nikash | King's Indian Attack, with e6 | |
| Jun 24, 2026 | Yessengali | 0–1 | Mazzi | Round 9: Yessengali, Adizhan - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Jun 23, 2026 | Mazzi | 1–0 | Boutikos | U16 Open | King's Indian Attack | |
| Jun 22, 2026 | Mazzi | 1–0 | Kaul | Round 7: Mazzi, Leonardo - Kaul, Krrish | Catalan Opening: Open Defense, Classical Line | |
| Jun 20, 2026 | Zizic | 1–0 | Mazzi | Round 6: Zizic, Djordje - Mazzi, Leonardo | Sicilian Defense: Moscow Variation | |
| Jun 19, 2026 | Feher | 1–0 | Mazzi | Round 5: Feher, Botond - Mazzi, Leonardo | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jun 18, 2026 | Mazzi | ½–½ | Francario | Round 4: Mazzi, Leonardo - Francario, Felice Maria | King's Indian Attack: Symmetrical Defense | |
| Jun 17, 2026 | Vesa | 0–1 | Mazzi | Round 3: Vesa, Mikke - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation, English Attack | |
| Jun 16, 2026 | Mazzi | 1–0 | Chen | Round 2: Mazzi, Leonardo - Chen, Ethan | King's Indian Attack | |
| Jun 15, 2026 | Prokhorov | 1–0 | Mazzi | Round 1: Prokhorov, Aleksey - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jan 3, 2026 | Mazzi | * | Schmuki | Round 9: Mazzi, Leonardo - Schmuki, Roman | ? | |
| Jan 2, 2026 | Verga | * | Mazzi | Round 8: Verga, Francesco - Mazzi, Leonardo | ? | |
| Jan 1, 2026 | Mazzi | * | Ortobelli Lozza | Round 7: Mazzi, Leonardo - Ortobelli Lozza, Marco | ? | |
| Dec 31, 2025 | Van Amerongen-Jansen | * | Mazzi | Round 6: Van Amerongen-Jansen, Peggy - Mazzi, Leonardo | ? | |
| Dec 30, 2025 | Di Girolamo | * | Mazzi | Round 5: Di Girolamo, Nicolo` - Mazzi, Leonardo | ? | |
| Dec 29, 2025 | Mazzi | * | Bakalarz | Round 4: Mazzi, Leonardo - Bakalarz, Mietek | ? | |
| Dec 28, 2025 | Frescura | * | Mazzi | Round 2: Frescura, Davide - Mazzi, Leonardo | ? | |
| Mar 5, 2025 | Mazzi | 0–1 | Albertini | Round 9: Mazzi, Leonardo - Albertini, Luca | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Mar 3, 2025 | Mazzi | 1–0 | Tellarini | Round 6: Mazzi, Leonardo - Tellarini, Lorenzo | Sicilian Defense: Taimanov Variation | |
| Jan 31, 2025 | Mazzi | 1–0 | Papler | Round 9: Mazzi, Leonardo - Papler, Peter | Philidor Defense: Lion Variation | |
| Jan 30, 2025 | Apaar Saxena | 1–0 | Mazzi | Round 8: Apaar Saxena - Mazzi, Leonardo | Queen's Gambit Declined | |
| Jan 28, 2025 | Kubicka | 1–0 | Mazzi | Round 2: Kubicka, Anna - Mazzi, Leonardo | Sicilian Defense: Moscow Variation, Main Line | |
| Jan 27, 2025 | Mazzi | 1–0 | Benazzo | Round 5: Mazzi, Leonardo - Benazzo, Angelo | Sicilian Defense: O'Kelly Variation, Venice System | |
| Jan 26, 2025 | Gregoric | 1–0 | Mazzi | Round 4: Gregoric, Andraz - Mazzi, Leonardo | Sicilian Defense: Moscow Variation, Main Line | |
| Jan 25, 2025 | Mazzi | 0–1 | Skrbec | Round 3: Mazzi, Leonardo - Skrbec, Leon | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Jan 25, 2025 | Ceschia | 0–1 | Mazzi | Round 2: Ceschia, Ivano - Mazzi, Leonardo | Queen's Pawn Game: Accelerated London System | |
| Jan 24, 2025 | Mazzi | 1–0 | Petrosino | Round 1: Mazzi, Leonardo - Petrosino, Germano | Italian Game: Anti-Fried Liver Defense | |
| Jan 6, 2025 | Mazzi | 1–0 | Bergamaschi | Round 6: Mazzi, Leonardo - Bergamaschi, Elia | ? | |
| Jan 6, 2025 | Mazzi | 1–0 | Caruso | Round 7: Mazzi, Leonardo - Caruso, Augusto | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jan 3, 2025 | Pieri | 1–0 | Mazzi | Round 1: Pieri, Pierre-Louis - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation | |
| Nov 3, 2024 | Mazzi | ½–½ | Simeone | Round 5: Mazzi, Leonardo - Simeone, Giulio | Caro-Kann Defense: Exchange Variation | |
| Nov 2, 2024 | Giampieri | 0–1 | Mazzi | Round 4: Giampieri, Stefano - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jul 6, 2024 | Mazzi | 0–1 | Lucchi | Round 9: Mazzi, Leonardo - Lucchi, Alessandro | Sicilian Defense: Open | |
| Jul 5, 2024 | Viti | 1–0 | Mazzi | Round 8: Viti, Matteo - Mazzi, Leonardo | Sicilian Defense: Najdorf Variation | |
| Jul 4, 2024 | Mazzi | 1–0 | De Mojana Di Cologna | Round 7: Mazzi, Leonardo - De Mojana Di Cologna, Arturo | Alekhine Defense: Exchange Variation | |
| Jul 2, 2024 | Mazzi | ½–½ | La Barbera | Round 5: Mazzi, Leonardo - La Barbera, Manfredi | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Feb 2, 2024 | Mazzi | ½–½ | Kekic | Hit Open 2024 | Petrov's Defense: Classical Attack, Marshall Variation | |
| Feb 1, 2024 | Centrih | 1–0 | Mazzi | Hit Open 2024 | Sicilian Defense: Modern Variations | |
| Jan 31, 2024 | Mazzi | 1–0 | Horvath | Hit Open 2024 | Italian Game: Classical Variation, Giuoco Pianissimo, with a6 | |
| Jan 29, 2024 | Dorokhina | 1–0 | Mazzi | Hit Open 2024 | Queen's Pawn Game: Accelerated London System | |
| Jan 28, 2024 | Mazzi | 0–1 | Kozlovic | Hit Open 2024 | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Jan 27, 2024 | Mazzi | ½–½ | Bazilius | Hit Open 2024 | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Jan 27, 2024 | Privitera | ½–½ | Mazzi | Hit Open 2024 | Nimzo-Larsen Attack: Classical Variation | |
| Jan 26, 2024 | Atakay | 0–1 | Mazzi | Hit Open 2024 | Catalan Opening: Closed Variation, Traditional Variation | |
| Nov 1, 2024 | Mazzi | 0–1 | Tellarini | Round 3: Mazzi, Leonardo - Tellarini, Lorenzo | Sicilian Defense: Taimanov Variation, Normal Variation | |
| Nov 1, 2024 | D Andrea | 0–1 | Mazzi | Round 2: D Andrea, Stefano - Mazzi, Leonardo | Sicilian Defense: O'Kelly Variation, Yerevan System | |
| Oct 31, 2024 | Mazzi | ½–½ | Bergamaschi | Round 1: Mazzi, Leonardo - Bergamaschi, Elia | French Defense: Winawer Variation, Advance Variation | |
| Nov 13, 2023 | Gkavardinas | 1–0 | Mazzi | u14 | Sicilian Defense: Najdorf Variation, English Attack | |
| Mar 22, 2023 | Mazzi | ½–½ | Cansu | Hit Open 2023 | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Mar 21, 2023 | Vicic | 0–1 | Mazzi | Hit Open 2023 | Nimzo-Larsen Attack: Modern Variation | |
| Mar 20, 2023 | Mazzi | 0–1 | Caruso | Hit Open 2023 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Mar 19, 2023 | Petrosino | 1–0 | Mazzi | 27th HIT Open | Nimzo-Indian Defense: Reshevsky Variation | |
| Mar 19, 2023 | Vogrin | 0–1 | Mazzi | Hit Open 2023 | Queen's Pawn Game: Accelerated London System | |
| Mar 18, 2023 | Mazzi | 0–1 | Gelardi | Hit Open 2023 | Scandinavian Defense: Mieses-Kotroc Variation | |
| Mar 17, 2023 | Mazzi | 0–1 | Praznik | Hit Open 2023 | Pirc Defense | |
| Mar 16, 2023 | Juvan | 0–1 | Mazzi | Hit Open 2023 | Sicilian Defense: Moscow Variation, Main Line | |
| Mar 16, 2023 | Piddubna | 1–0 | Mazzi | Hit Open 2023 | English Opening: Symmetrical Variation, Full Symmetry Line | |