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The '''National Duel Circuit''' was tournament held in [[Heartland]] where [[Reginald Kastle|Shark]], [[Quattro]] and other [[Duelist]]s participated, appearing in ''[[Yu-Gi-Oh! ZEXAL]]''.
Shark and Quattro faced each other in the tournament's finals. However, Quattro intentionally put his [[Deck]] on top of a pot, so that it fell and wound up scattered on the floor in the break room when Shark passed by it. As a result, Shark was disqualified before unleashing his winning move because he had seen Quattro's Deck before the [[Duel]]. Therefore, Quattro was considered the winner champion of the tournament.<ref>{{episode|Yu-Gi-Oh! ZEXAL|12|ref}}</ref>
==Participants==
