Gabriel Jesus scored twice as Arsenal earned a second victory over Crystal Palace in a week, with the 5-1 win moving the Gunners three points behind Premier League leaders Liverpool.
Jesus had ended his goal drought by scoring a hat-trick against the Eagles in the Carabao Cup in midweek and built on the display at Selhurst Park.
The Brazilian forward struck twice in the first half - either side of an equaliser by Ismaila Sarr - to have a remarkable run of five goals in 50 minutes against Crystal Palace this week.