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Sunderland v Arsenal: Five things learned from Gunners' stunning win over Black Cats
EXPRESS SPORT brings you five things learned from Arsenal's impressive win over Sunderland.
Alexis Sanchez fired Arsenal into the lead after 19 minutes before Jermain Defoe’s spot-kick put the hosts back on level terms.
However, substitute Olivier Giroud restored the visitors lead just minutes later.
The Frenchman added his second before Sanchez completed the rout scoring Arsenal's fourth of the afternoon 12 minutes from time.
Click through the gallery above to see five things learned from Arsenal’s impressive win over Sunderland.
Arsenal beat Sunderland at the Stadium of Light