We told you it is Super Sunday didn't we?
"I said to him when he arrived with us after the holidays, I want the best performance in his career from this player - and to work for that", Emery said.
City will be the first competitive opponents for Arsenal since the appointment of Guardiola's fellow Spaniard Unai Emery as manager in place of the long-serving Arsene Wenger. "He is a smart, intelligent, well-prepared manager, so he will know exactly what to do".
Looks like all the big teams are winning on the opening day of the season. They won just once on the road in the league after the turn of the year and they were knocked out of the Europa League in the semi-finals.
Cech suffered a heart-in-mouth moment as Arsenal tried, and failed, to play out from the back - the former Chelsea man nearly turning the ball into his own goal as he attempted to pass across to Mustafi.
Stephan Lichtsteiner and Ainsley Maitland Niles are options but Emery might have a rather unbelievable plan up his sleeve - playing Danny Welbeck at left-back.
Arsenal rarely threatened as an attacking force until the introduction of Alexandre Lacazette for the willing but unrewarded Aaron Ramsey early in the second half. Emery has confirmed his return to full training this week, and with a good pre-season under his belt, Ramsey could be donning the armband against the champions.
Raheem Sterling gave the visitors the lead inside 15 minutes when he cut inside Hector Bellerin before firing the ball past a near-motionless Petr Cech in the Arsenal goal. The new goalkeeper from Bayer Leverkusen might get the nod for his superior ability to play with the ball at his feet - a prerequisite against a team like City. At the end we will see our level.