#5 Eden Hazard comes on and changes the game
With the score still at 2-2, Sarri decided to give Eden Hazard a few minutes with the Belgian still being used cautiously after a long World Cup campaign. Chelsea were instantaneously energised as a result and looked far more threatening with Arsenal failing to test Kepa like they did in the first half.
Hazard's runs and dribbles on the left made him a constant threat and Hector Bellerin was guilty of abandoning his defensive duties at times. The third goal seemed inevitable and it was Hazard who created the opportunity out on the left.
Bellerin, looking to track Alonso's run, was neither committed to blocking Hazard nor tracking Alonso, allowing the Belgian to slip the ball through for Alonso to take it first time and beat Cech. Torreira was also guilty of allowing Alonso to get into the box unimpeded.
Chelsea have six points now while Arsenal are yet to get off the mark. But judging by the chances they had, they should have been more clinical to make this an even contest.