| Oct 11, 2025 | Lombardo | 1–0 | Marentini | Round 8: Lombardo, Filippo - Marentini, Marcel | Zukertort Opening: Sicilian Invitation | |
| Oct 10, 2025 | Marentini | ½–½ | Sutter | Round 7: Marentini, Marcel - Sutter, Julian | English Opening: Agincourt Defense | |
| Oct 9, 2025 | Khatibi | ½–½ | Marentini | Round 6: Khatibi, Amir Reza - Marentini, Marcel | King's Indian Attack: Spassky Variation | |
| Oct 9, 2025 | Marentini | 1–0 | Smith | Round 5: Marentini, Marcel - Smith, Lynda | Zukertort Opening: Dutch Variation | |
| Oct 7, 2025 | Bartonicek | 1–0 | Marentini | Round 4: Bartonicek, Zdenek - Marentini, Marcel | Indian Defense | |
| Oct 6, 2025 | Marentini | 1–0 | Kellner | Round 3: Marentini, Marcel - Kellner, Nikolaus | Tarrasch Defense: Classical Variation | |
| Oct 5, 2025 | Bellincampi | 1–0 | Marentini | Round 2: Bellincampi, Stefano - Marentini, Marcel | Sicilian Defense: Moscow Variation | |
| Oct 5, 2025 | Marentini | 1–0 | Zucchelli | Round 1: Marentini, Marcel - Zucchelli, Massimo | King's Indian Attack | |
| Apr 6, 2025 | Marentini | ½–½ | Polster | Round 9: Marentini, Marcel - Polster, Wolfgang, Dr. | Queen's Pawn Game | |
| Apr 5, 2025 | Schwarz | ½–½ | Marentini | Round 8: Schwarz, Arnd-Ruediger - Marentini, Marcel | Indian Defense: Dzindzi-Indian Defense | |
| Apr 4, 2025 | Kannenberg | ½–½ | Marentini | Round 7: Kannenberg, Karl-Heinz - Marentini, Marcel | French Defense: Advance Variation, Euwe Variation | |
| Apr 3, 2025 | Marentini | ½–½ | Lindam | Round 6: Marentini, Marcel - Lindam, Ingo | King's Indian Defense: Normal Variation, Rare Defenses | |
| Oct 13, 2024 | Marentini | ½–½ | Schweizer | SMM Nationalliga A 2024 | English Opening: Anglo-Indian Defense, Romanishin Variation | |
| Oct 12, 2024 | Toktomushev | 1–0 | Marentini | SMM Nationalliga A 2024 | Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation | |
| Jul 22, 2024 | Marentini | 1–0 | Hugentobler | Tiebreak: Marentini, Marcel - Hugentobler, Patrick | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 22, 2024 | Hugentobler | ½–½ | Marentini | Tiebreak: Hugentobler, Patrick - Marentini, Marcel | Sicilian Defense: Closed | |
| Jul 22, 2024 | Marentini | ½–½ | Hugentobler | Tiebreak: Marentini, Marcel - Hugentobler, Patrick | King's Indian Attack | |
| Jul 21, 2024 | Zuelle | ½–½ | Marentini | Round 9: Zuelle, Bruno - Marentini, Marcel | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Jul 20, 2024 | Marentini | 1–0 | Duerst | Round 8: Marentini, Marcel - Duerst, Martin | King's Indian Defense: Normal Variation, Rare Defenses | |
| Jul 19, 2024 | Wirz | 0–1 | Marentini | Round 7: Wirz, Heinz - Marentini, Marcel | Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation | |
| Jul 18, 2024 | Marentini | 1–0 | Adzic | Round 6: Marentini, Marcel - Adzic, Slobodan | King's Indian Attack | |
| Jul 16, 2024 | Hugentobler | ½–½ | Marentini | Round 4: Hugentobler, Patrick - Marentini, Marcel | Sicilian Defense: Closed | |
| Jul 15, 2024 | Marentini | 1–0 | Staechelin | Round 3: Marentini, Marcel - Staechelin, Ruedi | Réti Opening | |
| Jul 14, 2024 | Bagri | 1–0 | Marentini | Schweizer Einzelmeisterschaft 24 Seniors 60+ | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Jul 13, 2024 | Marentini | 1–0 | Huss | Round 1: Marentini, Marcel - Huss, Andreas | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jun 23, 2024 | Marentini | 0–1 | Medici | SUI-chT Bodan-Mendrisio | Zukertort Opening: Pirc Invitation | |
| Jun 5, 2024 | Marentini | 1–0 | Luginbuehl | Round 5: Marentini, Marcel - Luginbuehl, Robert | King's Indian Defense: Normal Variation, Rare Defenses | |
| Apr 28, 2024 | Heimann | 1–0 | Marentini | SUI-chT Riehen-Bodan | Sicilian Defense: Prins Variation | |
| Apr 13, 2024 | Marentini | 0–1 | Jahn | Round 8: Marentini, Marcel - Jahn, Peter | Zukertort Opening: Reversed Grünfeld | |
| Apr 12, 2024 | Pollmann | ½–½ | Marentini | Round 7: Pollmann, Sascha - Marentini, Marcel | King's Indian Attack: Spassky Variation | |
| Apr 9, 2024 | Lindam | 1–0 | Marentini | Round 4: Lindam, Ingo - Marentini, Marcel | French Defense: Classical Variation, Burn Variation, Main Line | |
| Mar 10, 2024 | Marentini | 0–1 | Hakimifard | SUI-chT Bodan-Luzern | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Dec 6, 2024 | Jermy | 1–0 | Marentini | Round 8: Jermy, Jaden - Marentini, Marcel | Indian Defense: Knights Variation | |
| Dec 5, 2024 | Marentini | 0–1 | Sivanandan | Round 7: Marentini, Marcel - Sivanandan, Bodhana | Réti Opening | |
| Dec 3, 2024 | Salem | 1–0 | Marentini | Round 6: Salem, Ihab - Marentini, Marcel | Sicilian Defense: Closed | |
| Dec 2, 2024 | Marentini | 0–1 | Franco | Round 5: Marentini, Marcel - Franco, Gaston | Catalan Opening: Open Defense, Classical Line | |
| Dec 1, 2024 | Murawski | 1–0 | Marentini | Round 4: Murawski, Jan - Marentini, Marcel | Nimzo-Indian Defense: Reshevsky Variation | |
| Nov 30, 2024 | Marentini | ½–½ | Freeland | Round 3: Marentini, Marcel - Freeland, Alex | English Opening: Neo-Catalan | |
| Nov 29, 2024 | Zhou | 1–0 | Marentini | Round 1: Zhou, Yang-Fan - Marentini, Marcel | Sicilian Defense: Najdorf Variation | |
| Nov 12, 2022 | Marentini | 0–1 | Kniest | 25th Open Bavarian Championship | English Opening: Agincourt Defense, Catalan Defense Accepted | |
| Nov 11, 2022 | Marentini | ½–½ | Weber | 25th Open Bavarian Championship | English Opening: Romanishin Gambit | |
| Nov 10, 2022 | Hildebrand | 0–1 | Marentini | 25th Open Bavarian Championship | ? | |
| Nov 9, 2022 | Marentini | 1–0 | Walda | 25th Open Bavarian Championship | ? | |
| Nov 8, 2022 | Schneider | 1–0 | Marentini | 25th Open Bavarian Championship | Italian Game: Scotch Gambit, Max Lange Attack | |
| Nov 7, 2022 | Marentini | 1–0 | Heyartz | 25th Open Bavarian Championship | ? | |
| Nov 6, 2022 | Costa | 1–0 | Marentini | 25th Open Bavarian Championship | Petrov's Defense: Paulsen Attack | |
| Nov 5, 2022 | Marentini | 1–0 | Schneider | 25th Open Bavarian Championship | King's Indian Attack | |
| Nov 6, 2021 | Koerber | 1–0 | Marentini | 24th Open Bavarian Championship | ? | |
| Nov 5, 2021 | Marentini | 0–1 | Ring | 24th Open Bavarian Championship | ? | |
| Nov 4, 2021 | Hess | 1–0 | Marentini | 24th Open Bavarian Championship | Petrov's Defense: Nimzowitsch Attack | |
| Nov 3, 2021 | Marentini | 1–0 | Pruetting | 24th Open Bavarian Championship | ? | |
| Nov 2, 2021 | Schuster | 1–0 | Marentini | 24th Open Bavarian Championship | Dutch Defense: Raphael Variation | |
| Nov 1, 2021 | Marentini | 1–0 | Lerchl | 24th Open Bavarian Championship | ? | |
| Oct 31, 2021 | Launert | 0–1 | Marentini | 24th Open Bavarian Championship | ? | |
| Oct 30, 2021 | Marentini | * | Kolb | 24th Open Bavarian Championship | ? | |