Arsenal scored three goals in eight second-half minutes to thrash rock-bottom Sunderland 4-1 and move top of the table.
Alexis Sanchez put the Gunners ahead in the 19th minute but Sunderland responded in the second-half thanks to Jermain Defoe's penalty after Duncan Watmore was brought down by Petr Cech.
With the game in the balance Arsene Wenger introduced Olivier Giroud and the Frenchman scored with his first touch in the 71st minute before securing the points with a deft header five minutes later.
Player Ratings
Sunderland: Pickford (6), Jones (6), Kone (5), O'Shea (5), Van Aanholt (6), Watmore (6), Rodwell (5), Ndong (5), Pienaar (6), Khazri (5), Defoe (6).
Subs used: Djilobodji (5), Januzaj (5), Gooch (N/A).
Arsenal: Cech (6), Bellerin (7), Mustafi (7), Koscielny (7), Gibbs (8), Elneny (7), Coquelin (7), Oxlade-Chamberlain (7), Ozil (7), Iwobi (7), Sanchez (9).
Subs: Ramsey (6), Giroud (8), Maitland-Niles (N/A).
Man of the Match: Alexis Sanchez.
