Arsenal won 1-0 against Chelsea in a London derby at the Emirates Stadium on Sunday.
Spain international Mikel Merino nodded home the winning goal in the 20th minute.
Merino stooped to flick his looping header over Robert Sanchez in the Chelsea goal after a Martin Odegaard corner.
Mikel Arteta’s side wasted other chances to double their lead afterwards.
The win left second-placed Arsenal 12 points behind Liverpool.
Chelsea meanwhile remain in fourth position despite the defeat.
