Martin Ødegaard's second-half strike secured Arsenal a 1-0 victory over Napoli in their Champions League opener. The Gunners dominated but squandered several chances, with Mikel Merino, Bukayo Saka, Piero Hincapié, and Noni Madueke all missing sitters. Ødegaard broke the deadlock in the 75th minute, firing in off the post after a patient build-up. Arsenal maintained their perfect start to the season, while Napoli's winless run continued under Massimiliano Allegri.