| 31 ago 2026 | Merkouropoulos, Dionysios 2197 | Kuntelia, Luka 2039 | ½-½ | E29 Nimzo-Indian Defense: Sämisch Variation | 19th Kalamaria International 2026 | Group A | 73 | Ver |
| 17 jul 2026 | Boutikos, Eleftherios 2189 | Merkouropoulos, Dionysios 2096 | 0-1 | B40 Sicilian Defense: French Variation, Normal | Greek Youth U20 Individual Championships 2026 | Open | 29 | Ver |
| 15 jul 2026 | Merkouropoulos, Dionysios 2096 | Mylonakis, Ioannis 2126 | 1-0 | E44 Nimzo-Indian Defense: St. Petersburg Variation | Greek Youth U20 Individual Championships 2026 | Open | 41 | Ver |
| 10 jul 2026 | Ntounias, Ioannis 2109 | Merkouropoulos, Dionysios 2096 | 1-0 | B33 Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | 53rd Greek Team Championship 2026 | 52 | Ver |
| 10 jul 2026 | Merkouropoulos, Dionysios 2096 | Lafkidis, Apostolos 2125 | 1-0 | E49 Nimzo-Indian Defense: Normal Variation, Botvinnik System | 53rd Greek Team Championship 2026 | 34 | Ver |
| 7 jul 2026 | Merkouropoulos, Dionysios 2096 | Kiryttopoulos, Ioannis 2123 | 1-0 | D35 Queen's Gambit Declined: Exchange Variation, Positional Variation | 53rd Greek Team Championship 2026 | 40 | Ver |
| 29 jun 2026 | Merkouropoulos, Dionysios 2096 | Vassis, Michail 2353 | 0-1 | E91 King's Indian Defense: Kazakh Variation | Greek Youth U20 Individual Championships 2026 | Open | 70 | Ver |
| 20 abr 2026 | Boutikos, Eleftherios 2136 | Merkouropoulos, Dionysios 2128 | ½-½ | B33 Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | Greek Youth U16 Individual Championship Finals 2026 | Open U16 | 71 | Ver |
| 18 abr 2026 | Zavrakidis, Nikolaos 2048 | Merkouropoulos, Dionysios 2128 | ½-½ | B45 Sicilian Defense: Four Knights Variation, Exchange Variation | Greek Youth U16 Individual Championship Finals 2026 | Open U16 | 53 | Ver |
| 22 mar 2026 | Tsaknakis, Zisis 2310 | Merkouropoulos, Dionysios 2104 | 1-0 | B33 Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | 3rd International Open Chess Tournament of Katerini Group A | 34 | Ver |
| 21 feb 2026 | Merkouropoulos, Dionysios 2108 | Stefanou, Dimitrios 2358 | 0-1 | A40 English Defense | 9th Vardaris Open 2026 | 38 | Ver |
| 9 oct 2025 | Gibala, Adam 2355 | Merkouropoulos, Dionysios 2136 | 1-0 | B12 Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | FIDE World Youth Chess Championships 2025 | Open U14 | 52 | Ver |
| 8 oct 2025 | Merkouropoulos, Dionysios 2136 | Zhauynbay Aldiyar 2332 | 1-0 | E93 King's Indian Defense: Petrosian Variation, Normal Defense | FIDE World Youth Chess Championships 2025 | Open U14 | 42 | Ver |
| 5 oct 2025 | Lacan Rus, David 2335 | Merkouropoulos, Dionysios 2136 | 1-0 | B18 Caro-Kann Defense: Classical Variation, Main Line | FIDE World Youth Chess Championships 2025 | Open U14 | 48 | Ver |
| 13 sep 2025 | Merkouropoulos, Dionysios 2136 | Papasimakopoulos, Alexandros 2361 | 0-1 | E48 Nimzo-Indian Defense: Normal Variation, Classical Defense | Blitz Ministry of Macedonia and Thrace | 35 | Ver |
| 13 sep 2025 | Grigorov, Grigor 2494 | Merkouropoulos, Dionysios 2136 | 1-0 | A46 Torre Attack: Classical Defense | Blitz Ministry of Macedonia and Thrace | 24 | Ver |
| 13 sep 2025 | Kourkoulos-Arditis, Stamatis 2583 | Merkouropoulos, Dionysios 2136 | 1-0 | A45 Indian Defense: Accelerated London System | Blitz Ministry of Macedonia and Thrace | 27 | Ver |
