Arsenal returned to winning ways in the Premier League with a 1-0 victory over Chelsea.
Mikel Arteta's men started brightly and went close early on through Leandro Trossard and Declan Rice's chances.
The deadlock was eventually broken by Mikel Merino, whose looping header from Martin Odegaard's cross beat Robert Sanchez in the Chelsea net.
Both sides struggled to create clear-cut chances in the second-half and in the end Arsenal ended their three-match winless run in the league.
The Gunners are now 12 points behind leaders Liverpool, while Chelsea remain fourth.