 The club's opening day defeat was the second in succession, and the third in four years (after defeats to Aston Villa and West Ham in 2013–14 and 2015–16, respectively).Walcott gave Arsenal the lead after missing a penalty, but a Philippe Coutinho free-kick drew the sides level before half-time.An Adam Lallana finish, a second for Coutinho and a goal for debutant Sadio Mané saw Arsenal go behind 4–1 after 63 minutes.