Arsenal moved up to second as Mikel Arteta’s men eased to victory at Bournemouth.
Bukayo Saka had been an injury doubt but headed into an empty net to open the scoring on his 87th consecutive Premier League appearance.
Saka could have had more had he not then handed over penalty duties.
Martin Odegaard has shared responsibility from the spot with Saka this season and the Norwegian slotted home Arsenal’s second before the break.
Both Saka and Odegaard then stood aside to give Kai Havertz the confidence boost of his first goal for the club when the Gunners were awarded a second spot-kick on 53 minutes.
Ben White rounded off the scoring in stoppage time.