Olivier Giroud and Alexis Sanchez each scored twice as Arsenal overcame Sunderland 4-1 at the Stadium of Light.
Substitute Olivier Giroud's first two goals of the season - from his first two touches of the match - secured a 4-1 win for Arsenal in Saturday's Premier League visit to Sunderland.
The France international, whose last goals came when he hit a hat-trick against Aston Villa on the final day of last season, turned in Kieran Gibbs' cross 19 minutes from time before glancing in a corner to seal a fourth away league win in a row for the Gunners.