Arsenal got their attacking groove on in Basel, and they were handed the added bonus of finishing top of Group A, thanks to PSG's surprising result against Ludogorets in the Champions League. A comprehensive 4-1 win was garnered courtesy a hat-trick from summer signing Lucas Perez.
Arsene Wenger named a strong starting XI, with Perez given the chance to play with the likes of Sanchez, Aaron Ramsey and Mesut Ozil. The Spaniard thrived in such company, helping himself to his first Arsenal treble, with Alex Iwobi scoring the other goal for the Premier League team.
Seydou Doumbia grabbed the consolation strike for Basel, who were eliminated from Europe by the defeat.
The opening goal came in just the eighth minute, with Alexis Sanchez lobbing the ball through to Kieran Gibbs, who squared it back for Lucas Perez to score his first Champions League goal for Arsenal from close-range.
Perez got his second goal eight minutes later and it was a similar one. Ozil, this time, slipped through a pass to Gibbs, who decided to shoot, and while the Basel goalkeeper Tomas Vaclik saved the initial strike, Perez was on hand to slot the rebound home.
Gibbs was crucial to Perez's third goal as well, with his interception and pass to Sanchez, eventually falling to the Spaniard, who finished quite well with his weaker right foot, shooting across the goalkeeper.
The fourth goal was a peach, with Ramsey passing to Sanchez, who found a nice ball for Ozil on the left channel, before the German laid the ball onto the path of Iwobi to score his first goal for Arsenal in this competition.
Substitute Doumbia struck 12 minutes from time to end David Ospina's hopes of a clean sheet, but it mattered little as Arsenal picked up an impressive win.
A win alone would not have been enough for Arsenal, who needed to better PSG's result going into the final round of matches in the group stage. Ludogorets held the French champions to a 2-2 draw, and, as a result, Arsenal topped Group A.