| Mar 22, 2026 | Merriman | 1–0 | Jackson | Round 8: Merriman, John - Jackson, Edward | Queen's Gambit Declined | |
| Mar 21, 2026 | Rathbone-Jones | 1–0 | Merriman | Round 7: Rathbone-Jones, Ifan - Merriman, John | Horwitz Defense | |
| Feb 15, 2026 | Merriman | 1–0 | Surtees | Round 5: Merriman, John - Surtees, Mike J | Modern Defense: Averbakh System | |
| Feb 15, 2026 | Melia | 0–1 | Merriman | Round 4: Melia, Alfie - Merriman, John | Nimzo-Indian Defense: Normal Variation, Schlechter Defense | |
| Feb 14, 2026 | Merriman | 1–0 | Doran | Round 3: Merriman, John - Doran, Chris | Benoni Defense: King's Pawn Line, with Bg5 | |
| Feb 14, 2026 | Pickles | 1–0 | Merriman | Round 2: Pickles, Stephen - Merriman, John | French Defense: Classical Variation, Shirov-Anand Variation | |
| Feb 13, 2026 | Merriman | 1–0 | Barwick | Round 1: Merriman, John - Barwick, Carmel | Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation | |
| Jan 11, 2026 | Kovalskyi | 1–0 | Merriman | Round 4: Kovalskyi, Roman - Merriman, John | French Defense: Advance Variation, Euwe Variation | |
| Jan 10, 2026 | Merriman | 1–0 | Navrotescu | Round 3: Merriman, John - Navrotescu, Andreea | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Nov 2, 2025 | Merriman | 1–0 | Southcott-Moyers | Round 2: Merriman, John - Southcott-Moyers, Indy | Queen's Gambit Declined: Chigorin Defense | |
| Nov 1, 2025 | Wall | ½–½ | Merriman | Round 1: Wall, Tim P - Merriman, John | Rapport-Jobava System | |
| Jul 20, 2025 | Ghasi | 1–0 | Merriman | ECF English Open Championship 2025 | Réti Opening: Advance Variation | |
| Jul 19, 2025 | Merriman | 0–1 | Royal | ECF English Open Championship 2025 | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Jul 19, 2025 | Richardson | 0–1 | Merriman | ECF English Open Championship 2025 | Queen's Gambit Declined: Tartakower Defense | |
| Jul 18, 2025 | Merriman | 1–0 | Bevis | ECF English Open Championship 2025 | King's Indian Defense: Steiner Attack | |
| Jul 18, 2025 | Pick | 0–1 | Merriman | ECF English Open Championship 2025 | French Defense: Tarrasch Variation, Guimard Defense, Main Line | |
| Jul 18, 2025 | Merriman | ½–½ | Patel | ECF English Open Championship 2025 | Semi-Slav Defense: Stoltz Variation | |
| May 5, 2025 | Shearsby | ½–½ | Merriman | Round 11: Shearsby, Jude - Merriman, John | French Defense: Tarrasch Variation, Guimard Defense, Main Line | |
| May 4, 2025 | Merriman | ½–½ | Southcott-Moyers | Round 10: Merriman, John - Southcott-Moyers, Indy | Queen's Gambit Declined: Modern Variation | |
| May 3, 2025 | Kacprzak | * | Merriman | Round 9: Kacprzak, Kacper - Merriman, John | ? | |
| Feb 9, 2025 | Armstrong | 0–1 | Merriman | Blackpool Open 2025 | King's Indian Attack | |
| Feb 9, 2025 | Armstrong | 0–1 | Merriman | Blackpool Chess Congress 2025: FIDE Open | King's Indian Attack | |
| Feb 8, 2025 | Merriman | ½–½ | McAtear | Blackpool Open 2025 | Queen's Indian Accelerated | |
| Feb 7, 2025 | Blackford | ½–½ | Merriman | Blackpool Open 2025 | French Defense: Tarrasch Variation, Morozevich Variation | |
| Jul 31, 2024 | Merriman | ½–½ | Pert | Round 5: Merriman, John - Pert, Richard G | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Jul 29, 2024 | Merriman | 1–0 | Mannion | Round 3: Merriman, John - Mannion, Stephen R | Queen's Gambit Accepted: Classical, Furman Variation | |
| Jul 28, 2024 | Salmons | 1–0 | Merriman | Round 2: Salmons, Calum - Merriman, John | Horwitz Defense | |
| Jul 27, 2024 | Merriman | ½–½ | Sachdeva | Round 1: Merriman, John - Sachdeva, Ronit | Slav Defense | |
| Jul 22, 2024 | Merriman | ½–½ | Antolak | Round 8: Merriman, John - Antolak, Julia | King's Indian Defense: Steiner Attack | |
| Jul 19, 2024 | Kolani | * | Merriman | Round 3: Kolani, Arjun - Merriman, John | ? | |
| Jul 16, 2024 | Teclaf | ½–½ | Merriman | Round 1: Teclaf, Pawel - Merriman, John | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Aug 4, 2024 | Merriman | ½–½ | Sooraj M R | Round 9: Merriman, John - Sooraj M R | Dutch Defense: Semi-Leningrad Variation | |
| Aug 3, 2024 | Wells | 1–0 | Merriman | Round 8: Wells, Peter K - Merriman, John | Indian Defense: Anti-Nimzo-Indian | |
| Aug 2, 2024 | Merriman | 1–0 | Starley | Round 7: Merriman, John - Starley, Robert | Nimzo-Indian Defense: Normal Variation, Classical Defense | |
| Aug 1, 2024 | Grieve | 1–0 | Merriman | Round 6: Grieve, Harry - Merriman, John | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 30, 2024 | Khoury | 0–1 | Merriman | Round 4: Khoury, Theo - Merriman, John | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 30, 2023 | Oscar Pollack | 0–1 | John Merriman | British Chess Championships 2023: Championship | French Defense: Tarrasch Variation, Morozevich Variation | |
| Jul 28, 2023 | Jackson | 1–0 | Merriman | British Chess Championships 2023: Championship | French Defense: Tarrasch Variation, Morozevich Variation | |
| Jul 26, 2023 | Claridge-Hansen | 1–0 | Merriman | British Chess Championships 2023: Championship | Catalan Opening: Closed | |
| Jul 25, 2023 | Merriman | 1–0 | Smith | British Chess Championships 2023: Championship | King's Indian Defense: Steiner Attack | |
| Jul 24, 2023 | Jackson | 1–0 | Merriman | British Chess Championships 2023: Championship | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 23, 2023 | Merriman | ½–½ | Willow | British Chess Championships 2023: Championship | Nimzo-Indian Defense: Normal Variation, Schlechter Defense | |
| Jul 22, 2023 | Koiza | 0–1 | Merriman | British Chess Championships 2023: Championship | Benoni Defense: Classical Variation, New York Variation | |
| May 29, 2023 | Jakhria | 0–1 | Merriman | English Open Championships 2023 | Benoni Defense: Knight's Tour Variation | |
| May 28, 2023 | Merriman | 0–1 | Harvey | English Open Championships 2023 | Nimzo-Indian Defense: Reshevsky Variation | |
| May 28, 2023 | Boswell | 0–1 | Merriman | English Open Championships 2023 | Benoni Defense: Knight's Tour Variation | |
| May 27, 2023 | Merriman | 1–0 | Pert | English Open Championships 2023 | Nimzo-Larsen Attack: Classical Variation | |
| May 27, 2023 | Badacsonyi | ½–½ | Merriman | English Open Championships 2023 | French Defense: MacCutcheon Variation | |
| Oct 16, 2022 | Merriman | ½–½ | Wells | Hull 4NCL International Open | Nimzo-Indian Defense: Reshevsky Variation | |
| Oct 16, 2022 | Christiansen | 1–0 | Merriman | Hull 4NCL International Open | French Defense: Advance Variation, Paulsen Attack | |
| Oct 15, 2022 | Merriman | 1–0 | Varley | Hull 4NCL International Open | Indian Defense: Anti-Grünfeld, Alekhine Variation | |
| Oct 15, 2022 | Kovalskyi | * | Merriman | Hull 4NCL International Open | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Oct 14, 2022 | Mesesan | 0–1 | Merriman | Hull 4NCL International Open | French Defense: Classical Variation, Delayed Exchange Variation | |
| Aug 21, 2022 | Merriman | ½–½ | Dishman | Chessable British Chess Championships: Championship | Slav Defense | |
| Aug 19, 2022 | Gormally | 1–0 | Merriman | Chessable British Chess Championships: Championship | French Defense: Tarrasch Variation, Morozevich Variation | |
| Aug 18, 2022 | Merriman | 1–0 | Derakhshani | Chessable British Chess Championships: Championship | Nimzo-Indian Defense: Reshevsky Variation | |
| Aug 17, 2022 | Merriman | 1–0 | Hebden | Chessable British Chess Championships: Championship | King's Indian Defense: Steiner Attack | |
| Aug 16, 2022 | Finn | 0–1 | Merriman | Chessable British Championship | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Aug 15, 2022 | Merriman | 0–1 | Kirk | Chessable British Championship | Nimzo-Indian Defense: Reshevsky Variation | |
| Aug 14, 2022 | Storey | 0–1 | Merriman | Chessable British Chess Championships: Championship | French Defense: Advance Variation, Main Line | |
| Aug 13, 2022 | Merriman | ½–½ | Ethelontis | Chessable British Championship | Nimzo-Indian Defense: Rubinstein System | |
| May 1, 2022 | Merriman | ½–½ | Bates | 4NCL Main League 1-2 | Nimzo-Indian Defense: Reshevsky Variation | |
| Apr 30, 2022 | McPhillips | 1–0 | Merriman | 4NCL Main League 1-2 | Indian Defense | |
| Mar 26, 2022 | Taylor | ½–½ | Merriman | 4NCL Main League 1-2 | Nimzo-Indian Defense: Classical Variation, Keres Defense | |
| Feb 13, 2022 | Bisby | 0–1 | Merriman | 4NCL Main League 1-2 | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Feb 12, 2022 | Merriman | 1–0 | Zulfic | 4NCL Main League 1-2 | Benko Gambit Declined: Sosonko Variation | |
| Nov 28, 2021 | Kay | * | Merriman | 4NCL Division 1_2 | ? | |
| Aug 30, 2021 | Merriman | 0–1 | Wells | Northumbria Masters | Semi-Slav Defense: Stoltz Variation | |
| Aug 29, 2021 | Merriman | ½–½ | Olson | Northumbria Masters | Queen's Gambit Declined: Modern Variation, Knight Defense | |
| Aug 29, 2021 | Bezuidenhout | * | Merriman | Northumbria Masters | French Defense: MacCutcheon Variation | |
| Aug 28, 2021 | Merriman | ½–½ | Villiers | Northumbria Masters | Rat Defense: English Rat | |
| Aug 28, 2021 | Siddharth | 0–1 | Merriman | Northumbria Masters | French Defense: Schlechter Variation | |
| Aug 27, 2021 | Merriman | 1–0 | Lim | Northumbria Masters | Semi-Slav Defense: Main Line | |
| Aug 27, 2021 | Mosnegutu | 0–1 | Merriman | Northumbria Masters | Indian Defense: Seirawan Attack | |
| — | Merriman | ½–½ | Stoica | British Chess Championships 2023: Championship | Neo-Grünfeld Defense: Goglidze Attack | |
| — | Merriman | 1–0 | Gardiner | Round 1: Merriman, John - Gardiner, Eric D | Lion Defense: Lion's Jaw | |
| — | Merriman | 1–0 | Brett | Round 3: Merriman, John - Brett, Andrew R | Nimzo-Indian Defense: Normal Variation, Gligoric System | |
| — | Merriman | 1–0 | McMichael | Round 5: Merriman, John - McMichael, Richard J | Dutch Defense: Classical Variation | |
| — | Merriman | 1–0 | Baker | Round 7: Merriman, John - Baker, Chris W | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| — | Jackson | 1–0 | Merriman | Chessable British Chess Championships: Championship | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| — | Homer | 0–1 | Merriman | Round 2: Homer, Stephen J - Merriman, John | French Defense: Tarrasch Variation, Guimard Defense, Main Line | |
| — | Crocker | ½–½ | Merriman | Round 4: Crocker, Philip J - Merriman, John | English Opening: Romanishin Gambit | |
| — | Arkell | ½–½ | Merriman | Round 6: Arkell, Keith C - Merriman, John | English Opening: Anglo-Indian Defense, Nimzo-English | |