Arsenal's French striker Olivier Giroud (L) is congratulated after scoring their third goal during the English Premier League football match between Sunderland and Arsenal at the Stadium of Light in Sunderland, northeast England on October 29, 2016.
PHOTO: AFP
The match turned on the introduction of Giroud as a 69th-minute substitute after a Jermain Defoe penalty had equalised Sanchez's first-half opener to give the home side a flicker of hope.
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Giroud scored with his opening two touches, first with a left-foot shot from a Kieran Gibbs cross on 71 minutes and then with a near-post header from a corner five minutes later.
Sanchez scored Arsenal's third goal in seven minutes from close in after Gibbs's shot had come off the post.
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Defeat means Sunderland have made the worst start to a season in Premier League history.
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