Premier League 2018-19: 3 reasons why Arsenal won 2-0 against Chelsea 

#2 An improved defensive display saw Arsenal emerge victorious against Chelsea

Koscielny was exceptional against Chelsea

An improved defensive display from The Gunners saw them emerge victorious against a toothless Chelsea side. Arsenal manager Unai Emery made a tactical tweak at the back as he changed from a back three (from the defeat to West Ham) to a back four comprising of Bellerin, Sokratis, Koscielny, and Kolasinac.

Often criticized for being weak at the back, Arsenal's rearguard put in an outstanding performance against a good Chelsea side. Arsenal centre-backs stepped up against Chelsea and thwarted The Blues by making a number of interceptions in key areas of the pitch.

Both Koscielny and Sokratis had a great game and the duo kept the likes of Hazard, Willian and Pedro quiet throughout the game. In a Man of the Match performance, Koscielny ended the game with an 84% pass accuracy rate, made three recoveries, and three interceptions. To top it all, the Frenchman scored the all-important second goal in the 39th minute.

Hector Bellerin and Sead Kolasinac impressed at full back and were equally good in attack and defense. Bellerin assisted Lacazette for Arsenal's first goal and also marshaled the likes of Marcos Alonso and Willian to great effect.

On the left, Kolasinac showed some great composure while dealing with Pedro and Azpilicueta and proved to be a constant threat while going forward. All in all, it was a much-improved performance from Arsenal's rearguard.