Super sub Olivier Giroud laid down a marker to Arsene Wenger after firing Arsenal to victory against Sunderland.
The Frenchman, who is yet to start a game all season, came off the bench and fired home with his first touch to restore the Gunners' lead in the second half.
And minutes later he bagged his second with a looping header to emphatically confirm the win.
Alexis Sanchez, the man starting up front in place of Giroud, opened the scoring with a bullet header in the first half and also rounded off proceedings on 77 minutes.
Jermain Defoe had looked to have given Sunderland a chance with his strike from the penalty spot.
Here is how everyone rated during the game...
Sunderland
Pickford 4
No chance for opener. Booming kick was best weapon.
Jones 4
Recalled but struggled as Arsenal passed around him.
O'Shea 4
Limped off with another injury. Looked his age.
Kone 4
Lost Sanchez for header. Cash in in January?
Van Aanholt 4
Nowhere near blocking the cross for opener.
Ndong 4
Booked. A passenger ambling around the midfield against class opponents.
Rodwell 4
Sunderland don't win in the league when he starts. 33 games and rising.
Khazri 4
Booked. Gave the ball away and looked unfit.
Pienaar 4
Booked. Lucky to stay on pitch after two bookable offences in first half.
Watmore 4
Won the penalty to get Sunderland back in the game.
Defoe 5
No service. But converted his penalty.
Subs
Djilobodji (O'Shea 42) Booked 3
Januzaj (Pienaar 70) 4
Gooch (Watmore 84)
Arsenal
Cech 6
Booked. Conceded penalty as Watmore charged through.
Bellerin 7
Lightning quick up wing and wasted not time passing out of defence.
Koscielny 7
Won all the aimless high balls punted his way.
Mustafi 6
Caught out by Watmore to let him in on goal for the penalty.
Gibbs 7
Booked. Added an attacking threat up the left wing.
Elneny 7
Did the dirty work to launch Arsenal's possession game.
Coquelin 7
Got stuck in to disrupt meek attacks.
Oxlade-Chamberlain 7
Whipped in a perfect cross to set up the goal.
Ozil 7
Buzzed around but missed his best chance.
Iwobi 7
Always a danger but sloppy shooting.
Sanchez 8 MOTM
Booked. Wonderful header to open the scoring killed the game off with his second.
Subs:
Giroud (Iwobi 69) 8
Ramsey (Oxlade-CHamberlain 76) 7
Maitland-Niles (Coquelin 89)