City started brightly and deservedly went ahead when Sterling brilliantly skipped past two Arsenal challenges on the edge of the box before unleashing a right-footed effort from 20 yards that flew past Cech.
Set what happened on the pitch aside, this was a huge day for Arsenal.
Bernardo Silva killed off Arsenal in the second half with this lovely, powerful finish.
That Arsenal's performance was somewhat disjointed shouldn't detract from City's display. Lovely inter-link play from Mendy and Sterling, the former cuts it back to Silva who lashes it home with a first-time shot into the top corner. "We have not had a lot of training sessions and 90 percent of the Arsenal players were together for the last month-and-a-half, two months".
It's an incredibly hard start for Unai Emery as the Gunners new chapter starts against a team tipped for more superiority after their exploits last season.
Bernd Leno is expected to be preferred in goal to Petr Cech, with Shkodran Mustafi and Sokratis the centre-back pairing.
Arsenal go into a Premier League season without Arsene Wenger for the first time since 1996. Emery clearly told the players to play out from the back but they didn't look comfortable and gave away possession on numerous occasions.
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It is the best league in the world. "I chose Everton because they gave me a lot of confidence". This is a great opportunity for me and I am looking forward to competing here.
But on the evidence of this game, City look ready to break that trend.
DF Ainsley Maitland-Niles, 6 - With Kolasinac injures and Nacho Monreal not yet ready, the Englishman was called upon to play at full-back.
MF Aaron Ramsey, 6 - It was a big boost to Arsenal to see the Welshman passed fit, and he was the man charged with spearheading Arsenal's new pressing system. This was where we left off last season: electric going forward, but capable of slowing the game down and dominating the ball when necessary.
Since joining the club earlier this year the striker has scored 10 goals in just 13 league games.
New Arsenal Manager Unai Emery, who makes his Premier League debut with the Gunners on Sunday.
The Argentine global is expected to be given the nod ahead of Gabriel Jesus but it will be interesting to see how the quick-footed striker manages to evade the robust Sokratis in the Arsenal backline.