| 9 ago 2026 | Chasin, Nico 2470 | Sundac, Ivano 2282 | 1-0 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Spilimbergo Master 2026 | 54 | Ver |
| 5 ago 2026 | Djuric, Leon 2217 | Sundac, Ivano 2282 | ½-½ | D02 Apertura de Peón de Dama: London System | 35. Juniorsko Prvenstvo Hrvatske | 54 | Ver |
| 4 ago 2026 | Sundac, Ivano 2282 | Horcicka, Jan 2086 | ½-½ | D05 Rubinstein Opening: Semi-Slav Defense | 35. Juniorsko Prvenstvo Hrvatske | 64 | Ver |
| 2 ago 2026 | Jakovic, Roko 2196 | Sundac, Ivano 2289 | ½-½ | B70 Defensa Siciliana: Dragon Variation, Classical Variation | 35. Juniorsko Prvenstvo Hrvatske | 34 | Ver |
| 1 ago 2026 | Sundac, Ivano 2289 | Tomljanovic, Ivano 2136 | 1-0 | E11 Defensa Bogoindia: Retreat Variation | 35. Juniorsko Prvenstvo Hrvatske | 60 | Ver |
| 26 jun 2026 | Assylov, Miras 2409 | Sundac, Ivano 2289 | ½-½ | B23 Defensa Siciliana: Closed | FIDE World Youth Chess Championships 2026 | O18 | 42 | Ver |
| 25 jun 2026 | Sundac, Ivano 2289 | Gut, Raphael 2245 | 1-0 | E15 Defensa India de Dama: Fianchetto Variation, Nimzowitsch Variation | FIDE World Youth Chess Championships 2026 | O18 | 34 | Ver |
| 24 jun 2026 | Tamas, Christian-Arrydan 2328 | Sundac, Ivano 2289 | 1-0 | B27 Defensa Siciliana: Hyperaccelerated Dragon | FIDE World Youth Chess Championships 2026 | O18 | 43 | Ver |
| 23 jun 2026 | Sundac, Ivano 2289 | Besou, Hussain 2411 | 1-0 | A46 Yusupov-Rubinstein System | World Youth Chess Championship 2026 U18 Open | 57 | Ver |
| 20 jun 2026 | Sundac, Ivano 2289 | Maglioni, Leonardo 2165 | ½-½ | D02 Apertura de Peón de Dama: London System | FIDE World Youth Chess Championships 2026 | O18 | 64 | Ver |
| 19 jun 2026 | Davudov, Tunar 2439 | Sundac, Ivano 2289 | 1-0 | B42 Defensa Siciliana: Kan Variation, Modern Variation | FIDE World Youth Chess Championships 2026 | O18 | 20 | Ver |
| 18 jun 2026 | Sundac, Ivano 2289 | Folin, Giorgio 2072 | 1-0 | E04 Apertura Catalana: Open Defense | FIDE World Youth Chess Championships 2026 | O18 | 47 | Ver |
| 17 jun 2026 | Zeihen, Matthieu 2067 | Sundac, Ivano 2289 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, Old Indian Formation | FIDE World Youth Chess Championships 2026 | O18 | 66 | Ver |
| 17 may 2026 | Djuric, Leon 2183 | Sundac, Ivano 2257 | ½-½ | D30 Gambito de Dama rehusado | Finale kupa Republike Hrvatske 2026 | 75 | Ver |
| 15 may 2026 | Safar, Sandro 2317 | Sundac, Ivano 2257 | 1-0 | D01 Rapport-Jobava System | Finale kupa Republike Hrvatske 2026 | 49 | Ver |
| 14 may 2026 | Sundac, Ivano 2257 | Radenic, Filip 2309 | 0-1 | E00 Apertura Catalana | Finale kupa Republike Hrvatske 2026 | 23 | Ver |
| 14 may 2026 | Kovacevic, Blazimir 2397 | Sundac, Ivano 2257 | 0-1 | A07 Ataque Indio de Rey: Pachman System | Finale kupa Republike Hrvatske 2026 | 72 | Ver |
| 13 may 2026 | Sundac, Ivano 2257 | Bosiocic, Marin 2549 | ½-½ | A47 Pseudo Queen's Indian Defense | Finale kupa Republike Hrvatske 2026 | 30 | Ver |
| 10 may 2026 | Sundac, Ivano 2257 | Matyassy, Lazar 2299 | ½-½ | E11 Defensa Bogoindia: Retreat Variation | mitropa-men | 34 | Ver |
| 9 may 2026 | Stickler, Florentin 2364 | Sundac, Ivano 2257 | 0-1 | B43 Defensa Siciliana: Kan Variation, Knight Variation | mitropa-men | 34 | Ver |