Layth Yousif at the Hawthorns 
Aaron Ramsdale (GK) - 8/10 - A clean sheet on an excellent debut. Showed anticipation to save well. Good distributiuon. And wished Gooners in the away end a safe trip home. A good night all round
Calum Chambers (RB) - 6.5/10 - Won player of the season at Fulham. But not at right back. Because he's not a right back. Still a future for him if Arteta plays him more centrally or as a defensive pivot.
Rob Holding (CB) - 7.5/10 - A good run out from our startingly bald centre back
Sead Kolasinac (CB) - 5/10 - Not quite sure how Kola became Arsenal's eighth highest paid player. Won't be for too much longer as Arteta and Edu are planning an August exit
Nuno Tavares (LB) - 7.5/10 - Our summer signing from Benfica had a really promising game. Looked tenacious while supplementing more attacking colleagues
Granit Xhaka (CM) - 7/10 - Not quite show how or why he was handed a long-term contract at the age of 29. But a tidy display albeit one against callow Baggies youngsters for the most part. City await
Mohamed Elneny (CM) - 7/10 - Neat and tidy and looked to play the ball forward. Which was nice
Martin Odegaard (AM) - 8/10 - An exciting display from an exciting player. At his creative best when he plays between the lines. A wonderful assist for the third goal.
Nicolas Pepe (RW) - 8.5/10 - Hit the woodwork twice in an influential performance full of running. Let's hope he can play at the same level on Saturday
Pierre-Emerick Aubameyang (ST) - 9/10 - Form is temporary. Class is permanent.
Bukayo Saka (LW) - 9/10 - One of our own. And don't we love him for it
Substitutes:
Ainsley Maitland-Niles - 6/10 - Good to see AMN get a good receoption from baggies fans after his spell at the Hawthorns last season. Wish he would accept a spell at right-back because he won't break into the Arsenal midfield on a regualr basis under Arteta
Alexandre Lacazette - 8/10 - Outstaning finish for his goal moments after coming on
Gabriel Martinelli - 7/10 - Our Brazilian Olympic gold medallist came on late in the game. Nearly scored at the death.
