The Spain international converted the all-important winner as the Blues momentarily moved nine points clear at the top of the Premier League table.
Jurgen Klopp's side returned to winning ways in some style with Divock Origi also on target as the hosts lose again to increase their fears of relegation.
The Gunners came from behind to put Mark Hughes' men to the sword at the Emirates Stadium on Saturday, with Theo Walcott, Mesut Ozil and Alex Iwobi all on the scoresheet.
Antonio Conte's side have gone four points clear at the top of the Premier League after an impressive comeback win at the Etihad Stadium despite their defender's blunder on the ...
The Spain international hit before half time to break the Black Cats' resolve, as Antonio Conte's men kept a firm hold on the Premier League summit.
The Reds looked set to pick up a comfortable three points against Eddie Howe's men, but the home side fought back to steal the win with a last minute goal.
The French attacker and the former Sweden captain scored two each, ensuring Jose Mourinho's men progressed in the EFL Cup.
The Armenian struck his second goal in as many games for the Red Devils as Jose Mourinho's men picked up a crucial Premier League victory at Old Trafford on Sunday.
The Chile international was the star of the show as the Gunners romped to victory with Mesut Ozil and Alex Oxlade-Chamberlain also on the scoresheet for the visitors.
Diafra Sakho's early goal gave the Hammers hope of a much-needed victory at Old Trafford, but the Sweden international levelled proceedings with an excellent header.
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