| Nov 22, 2025 | Berardi | ½–½ | Mertens | Round 9: Berardi, Giancarlo - Mertens, Marc | English Opening: King's English Variation, Two Knights Variation, Reversed Dragon | |
| Nov 19, 2025 | Mateu Guiu | ½–½ | Mertens | Round 7: Mateu Guiu, Esteve - Mertens, Marc | English Opening: Anglo-Indian Defense, King's Indian Formation | |
| Nov 19, 2025 | Mertens | 1–0 | Schaedler | Round 6: Mertens, Marc - Schaedler, Martin | Scandinavian Defense: Modern Variation | |
| Nov 18, 2025 | Mertens | 1–0 | Verdier | Round 5: Mertens, Marc - Verdier, Patrice | Sicilian Defense: Kan Variation, Knight Variation | |
| Nov 17, 2025 | Zerafa | 0–1 | Mertens | Round 4: Zerafa, Patrick - Mertens, Marc | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Nov 17, 2025 | Mertens | 1–0 | Brookfield | Round 3: Mertens, Marc - Brookfield, Toby | Sicilian Defense: Dragon Variation, Fianchetto Variation | |
| Nov 1, 2025 | Meyer | ½–½ | Mertens | Round 11: Meyer, Juergen - Mertens, Marc | Sicilian Defense: Moscow Variation | |
| Oct 31, 2025 | Mertens | ½–½ | Genovese | Round 10: Mertens, Marc - Genovese, Alberto | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Oct 30, 2025 | Wallner | 1–0 | Mertens | Round 9: Wallner, Joachim - Mertens, Marc | Nimzo-Larsen Attack: Indian Variation | |
| Oct 29, 2025 | Mertens | ½–½ | Kantorik | Round 8: Mertens, Marc - Kantorik, Marian | Ruy Lopez: Morphy Defense, Norwegian Variation | |
| Oct 28, 2025 | Tikzhanov | 1–0 | Mertens | Round 7: Tikzhanov, Yerlan - Mertens, Marc | Sicilian Defense: Alapin Variation | |
| Oct 26, 2025 | Mertens | 1–0 | Khatanbaatar | Round 6: Mertens, Marc - Khatanbaatar, Bazar | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Oct 25, 2025 | Al-Hajiri | 0–1 | Mertens | Round 5: Al-Hajiri, Bader - Mertens, Marc | Sicilian Defense: Chekhover Variation | |
| Oct 24, 2025 | Mertens | 0–1 | Van Ketel | Round 4: Mertens, Marc - Van Ketel, Raoul | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Oct 23, 2025 | Harstad | 0–1 | Mertens | Round 3: Harstad, Christian - Mertens, Marc | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Oct 22, 2025 | Mertens | 0–1 | Raetsky | Round 2: Mertens, Marc - Raetsky, Alexander | Ruy Lopez: Morphy Defense, Schliemann Defense Deferred | |
| Oct 21, 2025 | Colangeli | 0–1 | Mertens | Round 1: Colangeli, Claudio - Mertens, Marc | Benoni Defense: Czech Benoni Defense | |
| Sep 21, 2024 | Mertens | 0–1 | Frick | 45th FIDE Chess Olympiad | Sicilian Defense: Dragon Variation, Fianchetto Variation | |
| Sep 20, 2024 | Mertens | ½–½ | Rodgaard | 45th FIDE Chess Olympiad | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Sep 19, 2024 | Soliz Gabarrete | 0–1 | Mertens | 45th FIDE Chess Olympiad | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Sep 18, 2024 | Mertens | 1–0 | Edwards | 45th FIDE Chess Olympiad | Sicilian Defense: Dragon Variation, Fianchetto Variation | |
| Sep 16, 2024 | Mertens | 0–1 | Blackburn | 45th FIDE Chess Olympiad | French Defense: Tarrasch Variation, Closed Variation, Main Line | |
| Sep 14, 2024 | Mertens | 0–1 | Wafa | 45th FIDE Chess Olympiad | Ruy Lopez: Morphy Defense, Steinitz Deferred | |
| Sep 13, 2024 | Wanasunia | ½–½ | Mertens | 45th FIDE Chess Olympiad | Grünfeld Defense: Russian Variation | |
| Sep 12, 2024 | Pantzar | 1–0 | Mertens | 45th FIDE Chess Olympiad | Grünfeld Defense: Three Knights Variation, Petrosian System | |
| Sep 11, 2024 | Bye | 0–1 | Mertens | 45th FIDE Chess Olympiad | ? | |
| Jul 11, 2024 | Osiecki | ½–½ | Mertens | wst50 | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Jul 10, 2024 | Mertens | ½–½ | Kirby | wst50 | Sicilian Defense: Classical Variation, Fianchetto Variation | |
| Jul 9, 2024 | Skibbe | 0–1 | Mertens | wst50 | Sicilian Defense: Najdorf Variation | |
| Jul 7, 2024 | Mertens | 1–0 | Delaney | wst50 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 6, 2024 | Mertens | ½–½ | Slabek | wst50 | Scandinavian Defense: Modern Variation | |
| Jul 5, 2024 | Rasalingam | 0–1 | Mertens | wst50 | Sicilian Defense: Closed, Traditional | |
| Jul 4, 2024 | Mertens | 0–1 | Mitchell | wst50 | Pirc Defense: 150 Attack, Sveshnikov-Jansa Attack | |
| Jul 3, 2024 | Tsiganova | 1–0 | Mertens | wst50 | Grünfeld Defense: Three Knights Variation, Burille Variation | |
| Jul 2, 2024 | Mertens | 0–1 | Westphal | wst50 | St. George Defense | |
| Oct 1, 2023 | Mertens | 0–1 | Razafindratsima | European Chess Club Cup 2023 | Sicilian Defense: Najdorf Variation | |
