Arsenal beat Watford to earn their first victory of the season.
Both sides had one defeat and a draw from the opening two league matches but Arsenal’s impressive first-half performance earned them three points.
A Santi Cazorla penalty, Alexis Sanchez’s fumbled effort and Mesut Ozil’s header gave the Gunners a 3-0 lead at half-time.
Substitute Roberto Pereyra scored for the Hornets on his debut but it proved to be a consolation for the hosts.
Walter Mazzarri’s side put in a much-improved performance after the break but the Italian was made to wait for his first win as Watford manager.