LONDON, ENGLAND - AUGUST 12: Petr Cech of Arsenal looks dejected after conceding Manchester City's first goal during the Premier League match between Arsenal FC and Manchester City at Emirates Stadium on August 12, 2018 in London, United Kingdom. As evident by last week's community shield match, Walker at times played as a 3 centre back and Mendy ventured further up the field helping the attack by providing them with an extra option in possession.
He rewarded Pep Guardiola's faith with a lively showing and a clinically dispatched 14th-minute opener.
City have now lost only one away game in the league - at Liverpool - of their last 21, and manager Pep Guardiola felt their performance was close to ideal.
Petr Cech started in goal for Arsenal's defeat to Manchester City.
But the veteran goalkeeper was grasping at fresh air when Sterling sashayed inside to lash home a shot from the edge of the box.
Cech bailed out his ailing team-mates by thwarting Aymeric Laporte at point-blank range having parried Riyad Mahrez's free-kick.
City's excellence underlined the size of the task facing new Arsenal boss Emery as the Gunners begin life without Arsene Wenger. Going forward, things were made particularly hard for him by the absence of a natural left-back to lend him support.More news: Turkish president: United States set deadline to release detained pastor
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There were two offside goals scored, but that's about the only mere consolation Arsenal can take from this game.
"We wanted to show our performance but it is clear against Manchester City we could not give them this win".
Emery also insisted on Friday that Welbeck is not one of the players who would be free to leave before the European transfer window shuts at the end of the month. It might just be the best goal we've seen in the opening weekend of the Premier League.
To his credit, the 19-year-old Frenchman refused to hide under the relentless midfield examination that comes with tackling a Guardiola side. For Granit Xhaka, this wasn't the case.
To watch a live stream of the Arsenal vs. Manchester City English Premier League showdown, go to NBC Sports Live Extra, or download the NBC Sports Live Extra app for mobile devices and on set-top devices such as the Roku and Apple TV.
He faces a Guardiola who is now fully into the swing of things at Manchester City and had an unparalleled domestic campaign previous year where City racked up 100 points.
Mahrez bent an effort just wide of the post as he looked to mark his Premier League debut for the champions with a goal with City taking nearly complete control of proceedings leading up to the interval.