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Arsenal hosted the Baggies at the Emirates in the final match of Gameweek 6.
And Jay Rodriguez nearly put the visitors ahead after seven minutes when his shot hit the woodwork after he was brought down in the box by Shkodran Mustafi.
But Alexandre Lacazette fired Arsenal in front when he headed in the rebound by Alexis Sanchez’s free-kick.
The Frenchman doubled Arsenal’s lead with a second-half penalty to secure three points for Arsene Wenger’s men.
But who impressed the most for Arsenal?
His goal led more charmed life than a snake in a basket
Didn’t enjoy the scenery when Rodriguez took him for a walk
Lucky boy: that foul on J-Rod was a clear penalty
Terrific goal-line clearance denied Rodriguez certain equaliser
Eager as ever to get forward but limited impact in final third
Brought a pitchfork when tweezers were needed to unpick the lock
Quiet and steady, but so is your milkman’s float
Adds steel and substance to Gunners’ left flank
Less effective than of late until he won soft penalty
Sanchez 8 (MOM)
Back on song like jukebox with volume turned up
On target at home for third league game in a row