| 16 ago 2026 | Diaz Castro, Sergio 2173 | Plazuelo Pascual, Juan 2432 | ½-½ | C02 Defensa Francesa: Advance Variation, Milner-Barry Gambit, Main Line | CE RAPIDOS | 20 | Ver |
| 14 ago 2026 | Diaz Castro, Sergio 2264 | Rudzinska, Michalina 2245 | ½-½ | B15 Defensa Caro-Kann: Tartakower Variation | CECLUB_2D | 54 | Ver |
| 13 ago 2026 | Diaz Castro, Sergio 2264 | Maldonado Mena, German 2133 | 1-0 | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | CECLUB_2D | 27 | Ver |
| 30 may 2026 | Diaz Castro, Sergio 2171 | Gomez Ledo, Roberto Carlos 2397 | 0-1 | C42 Defensa Petrov: Nimzowitsch Attack | Ciudad de Dos Hermanas Open 2026 | 46 | Ver |
| 30 may 2026 | Anton Guijarro, David 2610 | Diaz Castro, Sergio 2171 | 1-0 | A46 Defensa India: Wade-Tartakower Defense | Ciudad de Dos Hermanas Open 2026 | 27 | Ver |
| 22 mar 2026 | Cuellar Montes, Alejandro 2189 | Diaz Castro, Sergio 2262 | ½-½ | B28 Defensa Siciliana: O'Kelly Variation, Normal System | DH Andalucia 2026 | 23 | Ver |
| 21 mar 2026 | Diaz Castro, Sergio 2262 | Perez Garcia, Alejandro 2000 2370 | ½-½ | B16 Defensa Caro-Kann: Bronstein-Larsen Variation | DH Andalucia 2026 | 33 | Ver |