In a tense Champions League quarter-final first leg at the Estádio José Alvalade, Arsenal survived a tactical, chess-like contest and were rewarded in stoppage time when Gabriel Martinelli fed Kai Havertz for a calm, decisive finish that earned a priceless 1–0 away lead. David Raya’s early fingertip save, disciplined defending, and a VAR intervention that disallowed Sporting’s strike all shaped a night of tight margins.