Lucas Perez scored a hat trick as Arsenal beat Basel 4-1 in the Champions League to top Group A ahead of Paris Saint-Germain.
Perez hit three goals inside the game's opening 47 minutes in Switzerland, with Alex Iwobi adding a fourth, as the Gunners claimed first place in their group after PSG drew 2-2 with Ludogorets Razgrad in Paris. It is the first time they have topped a Champions League group since the 2011-12 season.
Arsenal needed just eight minutes to open the scoring at St Jakob-Park, with Kieran Gibbs squaring the ball to Perez after being played in by Alexis Sanchez and the Spaniard then converting from close range at the far post.
Basel reacted well to falling behind and had the ball in the back of the net just two minutes later through Marc Janko, but the flag had already gone up for offside against Matias Delgado in the build-up.
By the 16th minute, however, the Gunners were two goals up after Perez added his second of the night, tapping home the rebound from just a few yards out after Gibbs' strike was saved by Tomas Vaclik.
Basel nearly pulled one back a few minutes later, with Adama Traore bending a strike just wide of the post from the edge of the area.
While Arsenal looked comfortable for the remainder of the first half, the hosts had two chances before the break -- Renato Steffen had an effort well stopped by David Ospina, before Delgado headed a delivery just over the bar.
Arsene Wenger's side came firing out of the traps in the second half, scoring a third two minutes after the restart, with Perez striking past Vaclik into the bottom corner to complete his hat trick after Gibbs' pass was diverted into his path by Sanchez.
And it was four for Arsenal just seven minutes later when Iwobi slotted home from close range after Mesut Ozil had pulled the ball back across goal to him.
The Gunners continued their search for more goals and almost found another in the 67th minute through Sanchez, but his swerving free kick crashed back off the crossbar with Vaclik rooted to the spot.
Basel pulled one back in the 78th minute through Seydou Doumbia, who played a one-two with Janko before slipping the ball past Ospina, but Arsenal were able to see out the remainder of the game with Ludogorets doing them a favour in Paris.