| May 30, 2026 | Klymenko | 1–0 | Mersmann | DEM U14w 2026 | Ponziani Opening: Jaenisch Counterattack | |
| May 29, 2026 | Mersmann | 1–0 | Wolf | DEM U14w 2026 | Sicilian Defense: Closed | |
| May 28, 2026 | Fruth | 0–1 | Mersmann | DEM U14w 2026 | Italian Game: Scotch Gambit, Walbrodt-Baird Gambit | |
| May 27, 2026 | Mersmann | 0–1 | Schmidt | DEM U14w 2026 | Ruy Lopez: Closed, Delayed Exchange | |
| May 27, 2026 | Sobczak | 1–0 | Mersmann | DEM U14w 2026 | Italian Game: Classical Variation, Greco Gambit, Modern Line | |
| May 26, 2026 | Mersmann | 1–0 | Tu | DEM U14w 2026 | Italian Game: Giuoco Piano | |
| May 25, 2026 | Schirmbeck | 1–0 | Mersmann | DEM U14w 2026 | Neo-Grünfeld Defense: Classical Variation, Modern Defense | |
| May 24, 2026 | Mersmann | 1–0 | Stiehler | DEM U14w 2026 | French Defense: Exchange Variation | |
| May 24, 2026 | Werner | 0–1 | Mersmann | DEM U14w 2026 | Three Knights Opening | |
| Dec 30, 2024 | Fruth | 1–0 | Mersmann | DVM U12w 2024 | Scotch Game: Classical Variation | |
| Dec 29, 2024 | Mersmann | 1–0 | Mandziuk | DVM U12w 2024 | Four Knights Game: Spanish Variation, Rubinstein Variation | |
| Dec 29, 2024 | Bayer | 1–0 | Mersmann | DVM U12w 2024 | Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation | |
| Dec 28, 2024 | Mersmann | 0–1 | Klymenko | DVM U12w 2024 | Caro-Kann Defense | |
| Dec 28, 2024 | Feldhaus | ½–½ | Mersmann | DVM U12w 2024 | Rapport-Jobava System | |
| Dec 27, 2024 | Mersmann | ½–½ | Noennig | DVM U12w 2024 | Four Knights Game: Spanish Variation, Symmetrical Variation | |
| Dec 27, 2024 | Winkler | 0–1 | Mersmann | DVM U12w 2024 | Italian Game: Classical Variation | |
| Oct 6, 2024 | Bursan | 0–1 | Mersmann | Deutsche Ländermeisterschaft 2024 | ? | |
| Oct 5, 2024 | Mersmann | 0–1 | Noennig | Deutsche Ländermeisterschaft 2024 | Italian Game: Giuoco Pianissimo, Normal | |
| Oct 5, 2024 | Albrecht | 1–0 | Mersmann | Deutsche Ländermeisterschaft 2024 | English Opening: Agincourt Defense | |
| Oct 4, 2024 | Mersmann | 0–1 | Stiehler | Deutsche Ländermeisterschaft 2024 | French Defense: Horwitz Attack, Papa-Ticulat Gambit | |
| Oct 4, 2024 | Baklan | ½–½ | Mersmann | Deutsche Ländermeisterschaft 2024 | Bishop's Opening: Vienna Hybrid | |
| Oct 3, 2024 | Mersmann | 0–1 | Ratushna | Deutsche Ländermeisterschaft 2024 | Italian Game: Hungarian Defense | |
| Oct 3, 2024 | Lu | ½–½ | Mersmann | Deutsche Ländermeisterschaft 2024 | Italian Game: Hungarian Defense | |
| May 25, 2024 | Mersmann | 1–0 | Rose | ODJM B 2024 | Four Knights Game: Spanish Variation, Rubinstein Variation Accepted | |
| May 24, 2024 | Fischer | ½–½ | Mersmann | ODJM B 2024 | Tarrasch Defense: Dubov Tarrasch | |
| May 23, 2024 | Mersmann | 0–1 | Alugili | ODJM B 2024 | Four Knights Game: Spanish Variation, Rubinstein Variation, Henneberger Variation | |
| May 22, 2024 | Mersmann | 0–1 | Boettcher | ODJM B 2024 | Scandinavian Defense: Valencian Variation | |
| May 22, 2024 | Frank | * | Mersmann | ODJM B 2024 | King's Indian Attack | |
| May 21, 2024 | Mersmann | ½–½ | Goeb | ODJM B 2024 | Italian Game: Giuoco Pianissimo | |
| May 20, 2024 | Tulchynsky | ½–½ | Mersmann | ODJM B 2024 | Italian Game: Classical Variation, Giuoco Pianissimo | |
| May 19, 2024 | Mersmann | 0–1 | Studzinski | ODJM B 2024 | Four Knights Game: Spanish Variation | |
| May 19, 2024 | Meijers | 0–1 | Mersmann | ODJM B 2024 | Queen's Gambit Accepted: Old Variation | |
| Jun 11, 2022 | Tu | 1–0 | Mersmann | DEM U10w 2022 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 10, 2022 | Mersmann | 0–1 | Hladeniuk | DEM U10w 2022 | Caro-Kann Defense: Advance Variation | |
| Jun 10, 2022 | Mersmann | 1–0 | Malagatte | DEM U10w 2022 | Vienna Game: Falkbeer Variation | |
| Jun 9, 2022 | Englert | ½–½ | Mersmann | DEM U10w 2022 | Queen's Gambit Declined: Charousek Variation | |
| Jun 8, 2022 | Mersmann | 1–0 | Weyerer | DEM U10w 2022 | French Defense: Advance Variation, Wade Variation | |
| Jun 8, 2022 | Margaryan | 0–1 | Mersmann | DEM U10w 2022 | Queen's Pawn Game: Colle System | |
| Jun 7, 2022 | Mersmann | ½–½ | Nönnig | DEM U10w 2022 | Queen's Pawn Game: Levitsky Attack | |
| Jun 6, 2022 | Stiehler | 0–1 | Mersmann | DEM U10w 2022 | Italian Game: Giuoco Piano | |
| Jun 6, 2022 | Schirmbeck | 1–0 | Mersmann | DEM U10w 2022 | Italian Game: Giuoco Piano | |
| Jun 5, 2022 | Mersmann | * | Kühn | DEM U10w 2022 | English Opening: The Whale | |
| Jun 5, 2022 | Mersmann | * | Kovalskyy | DEM U10w 2022 | Vienna Game: Vienna Gambit | |