In the ancient port city of Naples, where football is religion and defeat cuts deep, Arsenal's captain Martin Odegaard offered a reminder that persistence, not perfection, is often the truest measure of a great side. A single thunderous strike in the 75th minute — deflected in off the post — converted an evening of squandered chances into three precious points, opening Arsenal's Champions League campaign with the quiet confidence of a team that knows how to win without always knowing how to dazzle. For Napoli, already wounded before kickoff, the loss deepens a troubling early-season spiral.