Chelsea 3-2 Arsenal: 4 Key Takeaways from this season's first game at Stamford Bridge

#3 Difficult start cannot define Emery

Unai Emery must be ruing his luck having been drafted to face Manchester City and Chelsea in his two introduction games to the Premier League.

Arsenal do not come up against another of their top six opponents until November, when they welcome Liverpool to the Emirates, allowing Emery at least two months to build momentum and impose his philosophy onto his new side.

Expect a more assured Arsenal side in the next few games.

#4 Hazard is irreplaceable for Chelsea

No matter how much money Real or another side throw at Chelsea for the services of Hazard, they're unlikely to obtain anyone on the same level to replace the Belgian.

Hazard's introduction to the game leaned Chelsea closer to the win, with him constantly picking up the ball on the turn and charging into the final third.

As he did last week when he made a substitute appearance, Hazard left the field having collected an assist for Chelsea's third goal of the game.

Tying him down long-term must be the priority for the Blues as he's an essential cog in Sarri's machine.