| 19 jul 2026 | Villanueva, Mario 2466 | Ramirez Camilla, Agustin 2044 | 1-0 | B43 Defensa Siciliana: Kan Variation, Knight Variation | XIII Open de Lebu 2026 | 26 | Ver |
| 18 jul 2026 | Bahamondes Ortiz, Benjamin 2181 | Villanueva, Mario 2466 | ½-½ | E11 Defensa Bogoindia: Retreat Variation | XIII Open de Lebu 2026 | 25 | Ver |
| 18 jul 2026 | Villanueva, Mario 2466 | Salinas Herrera, Pablo 2447 | 0-1 | C50 Apertura Italiana: Giuoco Pianissimo, Italian Four Knights Variation | XIII Open de Lebu 2026 | 36 | Ver |
| 17 jul 2026 | Chacon Salinas, Cesar 2187 | Villanueva, Mario 2466 | 0-1 | E11 Defensa Bogoindia: Retreat Variation | XIII Open de Lebu 2026 | 41 | Ver |
| 15 jul 2026 | Barria Arbunic, Manuel 2015 | Villanueva, Mario 2466 | 0-1 | E16 Defensa India de Dama: Capablanca Variation | XIII Open de Lebu 2026 | 68 | Ver |
| 12 jun 2026 | Villanueva, Mario 2466 | Castro Salgado, Pablo 2184 | 1-0 | C50 Apertura Italiana: Giuoco Pianissimo, Italian Four Knights Variation | XIII Open de Lebu 2026 | 34 | Ver |
| 25 may 2026 | Tomasi, Albert 2328 | Villanueva, Mario 2463 | 0-1 | C13 Defensa Francesa: Alekhine-Chatard Attack, Albin-Chatard Gambit | IV Open Ciudad de Buenos Aires | 35 | Ver |
| 24 may 2026 | Villanueva, Mario 2463 | Vasquez Schroeder, Rodrigo 2453 | 0-1 | B12 Defensa Caro-Kann: Advance Variation, Short Variation | IV Open Ciudad de Buenos Aires | 60 | Ver |
| 23 may 2026 | Jardim, Frederico Rodrigues 2321 | Villanueva, Mario 2463 | 0-1 | E19 Defensa India de Dama: Classical Variation, Traditional Variation, Main Line | IV Open Ciudad de Buenos Aires | 56 | Ver |
| 22 may 2026 | Bazan Romero, Octavio Aaron 2301 | Villanueva, Mario 2463 | ½-½ | C02 Defensa Francesa: Advance Variation, Euwe Variation | IV Open Ciudad de Buenos Aires | 27 | Ver |
| 20 may 2026 | Ocampos, Ian 2240 | Villanueva, Mario 2463 | ½-½ | C11 Defensa Francesa: Steinitz Variation, Boleslavsky Variation | IV Open Ciudad de Buenos Aires | 56 | Ver |
| 19 may 2026 | Villanueva, Mario 2463 | Giampa, Alejandro 2147 | 1-0 | C55 Apertura Italiana: Two Knights Defense, Modern Bishop's Opening | IV Open Ciudad de Buenos Aires | 55 | Ver |
| 19 abr 2026 | Di Berardino, Diego Rafael 2460 | Villanueva, Mario 2462 | ½-½ | A40 English Defense | II Rio Chess Masters 2026 (ITT) | 32 | Ver |
| 18 abr 2026 | Villanueva, Mario 2462 | Delgado Ramirez, Neuris 2505 | ½-½ | C42 Defensa Petrov: Millennium Attack | II Rio Chess Masters 2026 (ITT) | 26 | Ver |
| 17 abr 2026 | Melian, Juan Sebastian 2382 | Villanueva, Mario 2462 | 0-1 | C09 Defensa Francesa: Tarrasch Variation, Open System, Main Line | II Rio Chess Masters 2026 (ITT) | 53 | Ver |
| 16 abr 2026 | Villanueva, Mario 2462 | Cunha, Lucas Aguiar 2238 | 1-0 | B01 Defensa Escandinava: Gubinsky-Melts Defense | II Rio Chess Masters 2026 (ITT) | 45 | Ver |
| 15 abr 2026 | Arenas, David 2343 | Villanueva, Mario 2462 | ½-½ | A10 Apertura Inglesa | II Rio Chess Masters 2026 (ITT) | 35 | Ver |
| 14 abr 2026 | Villanueva, Mario 2462 | Ticona Rocabado, Licael Roderick 2416 | 0-1 | C50 Apertura Italiana: Giuoco Pianissimo, Normal | II Rio Chess Masters 2026 (ITT) | 51 | Ver |
| 12 abr 2026 | Soriano Quispe, Ivan Excender 2376 | Villanueva, Mario 2462 | 0-1 | C02 Defensa Francesa: Advance Variation, Euwe Variation | II Rio Chess Masters 2026 (ITT) | 37 | Ver |
| 11 abr 2026 | Villanueva, Mario 2462 | Ribeiro, Matheus Mendes Domingues 2313 | ½-½ | B40 Defensa Siciliana: Pin Variation, Koch Variation | II Rio Chess Masters 2026 (ITT) | 32 | Ver |