Eberechi Eze netted against his former club as Arsenal defeated Crystal Palace to extend their lead at the top of the Premier League table to four points.
Eze joined Arsenal in a deal worth £67m in the summer and his winner came from another trademark Arsenal set-piece.
Declan Rice curled a free-kick into the area which was knocked down by centre-back Gabriel, then Eze acrobatically fired the ball into the corner of the net.
Crystal Palace, who lost to AEK Larnaca in midweek, did threaten on occasion with Jean-Philippe Mateta battling against the solid Arsenal defence – but they did not trouble David Raya in goal.
Arsenal nearly doubled their lead in the second half when Gabriel hit the crossbar with a header and Bukayo Saka went close with a curled effort from the edge of the penalty area.
The win means Arsenal are now unbeaten in 10 matches in all competitions.
Arsenal are a challenge for anyone and the Palace players visibly tired as the match reached the latter stages.
Oliver Glasner will have to think how best to rotate his players while the fixture schedule for his team is so congested.
Palace are now without a win in four games in all competitions but it has still been a solid start for them in the Premier League this season, with 13 points from nine games.
