| Jan 31, 2026 | Valente | 1–0 | Grassi | 21º Open Internazionale di Bolzano | Sicilian Defense: French Variation | |
| Nov 2, 2025 | Grassi | 1–0 | Bianchi | Round 6: Grassi, Sebastiano - Bianchi, Gabriel | Caro-Kann Defense: Classical Variation, Seirawan Variation | |
| Nov 1, 2025 | Grassi | ½–½ | Marchenkov | Round 5: Grassi, Sebastiano - Marchenkov, Lorenzo | Sicilian Defense: Four Knights Variation | |
| Nov 1, 2025 | Grassi | 0–1 | Tatulli Uva | Round 4: Grassi, Sebastiano - Tatulli Uva, Alberto | French Defense: Chigorin Variation | |
| Oct 31, 2025 | Peccianti | 1–0 | Grassi | Round 3: Peccianti, Marco - Grassi, Sebastiano | Sicilian Defense: Kan Variation, Wing Attack | |
| Oct 31, 2025 | Grienti | 0–1 | Grassi | Round 2: Grienti, Giorgio - Grassi, Sebastiano | Sicilian Defense: Alapin Variation | |
| Oct 30, 2025 | Grassi | 1–0 | Montagnoli | Round 1: Grassi, Sebastiano - Montagnoli, Matteo | English Opening: King's English Variation | |
| Oct 19, 2025 | Grassi | ½–½ | Bordignon | Round 5: Grassi, Sebastiano - Bordignon, Angelo | Sicilian Defense: Kalashnikov Variation | |
| Oct 19, 2025 | Jekel | 0–1 | Grassi | Round 4: Jekel, Wolfgang - Grassi, Sebastiano | Pirc Defense: Classical Variation, Schlechter Variation | |
| Oct 18, 2025 | Grassi | 0–1 | Budai | Round 3: Grassi, Sebastiano - Budai, Federico | Sicilian Defense: Najdorf Variation | |
| Oct 18, 2025 | Heppt | 0–1 | Grassi | Round 2: Heppt, Daniel - Grassi, Sebastiano | Zukertort Opening: Quiet System | |
| Oct 17, 2025 | Grassi | 0–1 | Olivetti | Round 1: Grassi, Sebastiano - Olivetti, Davide | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 6, 2024 | Grassi | ½–½ | Tona | Round 9: Grassi, Sebastiano - Tona, Leonardo | Caro-Kann Defense: Classical Variation, Seirawan Variation | |
| Jul 5, 2024 | Costalonga | ½–½ | Grassi | Round 8: Costalonga, Riccardo - Grassi, Sebastiano | London System | |
| Jul 4, 2024 | Grassi | 1–0 | Giorgetti | Round 7: Grassi, Sebastiano - Giorgetti, Federico | Sicilian Defense: Accelerated Dragon | |
| Jul 3, 2024 | Gabellini | 0–1 | Grassi | Round 6: Gabellini, Alexander - Grassi, Sebastiano | Sicilian Defense: Closed, Traditional | |
| Jul 2, 2024 | Grassi | 1–0 | Manni | Round 5: Grassi, Sebastiano - Manni, Cristian | Petrov's Defense: Classical Attack, Marshall Variation | |
| Jul 1, 2024 | Grassi | 0–1 | Buonagurio | Round 3: Grassi, Sebastiano - Buonagurio, Filippo | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Jun 30, 2024 | Revoltella | 0–1 | Grassi | Round 2: Revoltella, Federico - Grassi, Sebastiano | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Jun 29, 2024 | Grassi | 1–0 | Caiazzo | Round 1: Grassi, Sebastiano - Caiazzo, Pierluigi | Caro-Kann Defense: Classical Variation, Main Line | |
| Jul 9, 2023 | Circolari Mattia | ½–½ | Grassi Sebastiano | Round 9: Circolari Mattia - Grassi Sebastiano | King's Indian Attack: Sicilian Variation | |
| Jul 8, 2023 | Grassi Sebastiano | 0–1 | Scrimieri Gabriele | Round 8: Grassi Sebastiano - Scrimieri Gabriele | Ruy Lopez: Berlin Defense, Improved Steinitz Defense | |
| Jul 7, 2023 | Rolle Lorenzo | 0–1 | Grassi Sebastiano | Round 7: Rolle Lorenzo - Grassi Sebastiano | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 6, 2023 | Grassi Sebastiano | ½–½ | Di Liberto Michele | Round 6: Grassi Sebastiano - Di Liberto Michele | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 6, 2023 | Belotti Edo Giacomo | 0–1 | Grassi Sebastiano | Round 5: Belotti Edo Giacomo - Grassi Sebastiano | King's Indian Defense: Semi-Classical Variation | |
| Jul 4, 2023 | Pitzeri Daniel Michele | ½–½ | Grassi Sebastiano | Round 3: Pitzeri Daniel Michele - Grassi Sebastiano | French Defense: Classical Variation, Steinitz Variation | |
| Jul 3, 2023 | Grassi Sebastiano | 1–0 | Brombin Alessio | Round 2: Grassi Sebastiano - Brombin Alessio | Scandinavian Defense: Mieses-Kotroc Variation | |
| Jul 2, 2023 | Di Sante Leonardo | 0–1 | Grassi Sebastiano | Round 1: Di Sante Leonardo - Grassi Sebastiano | French Defense | |
