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.
Seconds later, City had scored again, Bernardo producing a spectacular first-time left-footed finish that flew into the top corner in emphatic fashion.
The Gunners are looking to finish in the top four for the first time since 2015-16 following two hard campaigns under Arsene Wenger.
The City manager has rejected the notion that his stars, who won the league title by a record 19 points three months ago, should forget about that glorious campaign and focus only on the months ahead.
Since joining the club earlier this year the striker has scored 10 goals in just 13 league games.
Emery now has a clear sense of the task he faces, throwing his arms in the air in frustration as the goals were conceded.
"It is impossible to have the season all the time that is ideal".
Sadio Mane netted in first-half stoppage time and eight minutes after the break.
The opening weekend of the new Premier League season has served up a delicious treat.
"I thought it was a good pass myself", Hughes joked. I like this spirit. "[On Thursday] the transfer window closed and our players will stay with us".
Guardiola has said losing is his greatest fear and says his players must be motivated by how they got over the line in spectacular fashion last season. But after that we start with a new way. "In the second half, we forced them to make mistakes and we had some opportunities. That didn't change, so then I made personnel changes".
Pre-season training has included intense double sessions and players can brace themselves for the hairdryer treatment if they do not reach the high standards set by the former Paris Saint-Germain and Sevilla manager. It's always better to have the ability to change.
The decision to start Guendouzi will certainly be questioned when you consider that Lucas Torreira was available, but the game itself provided a glimpse at how the gulf in class has widened between these two sides over the past few years. Video assistant referees are not being used in the league.