But Pep Guardiola's side switched off defensively and DeAndre Yedlin was rewarded for a lung-bursting run when Salomon Rondon picked him out to level with half an hour played.
Newcastle had Dubravka to thank for keeping his side in the contest, as Man City had to settl for just the one-goal margin.
City have been transformed from Premier League also-rans to serial winners during that time, finishing top of the table last season with a record of 100 points. With such a formidable attack, the hosts were still largely wasteful in front of goal.
Guardiola felt Sane's performances in pre-season training were sub-standard but, amid suggestions of a him being unhappy with the winger's attitude, the City manager told BT Sport there was no need for alarm and later claimed to be "sad" for the player at his post-match news conference.
Federer beats heat, Paire to advance in US Open
ET on ESPN+): For a solid part of the first-round match against Petkovic, it looked like Ostapenko was not going to make it. In part, that's because elite tennis players often used to become not-so-elite by the time they passed the age of 30.
Argentina global Sergio Aguero provided the assist that helped Kyle Walker to score the winning goal for Manchester City in the 52nd minute. As well as fulfilling his defensive duties, Walker was an outlet for his side on the flank, particularly in the second-half.
8' - GOAL! Man City 1-0 Newcastle: Raheem Sterling with a typical Raheem Sterling goal. Mendy works the ball to Sterling in a wide position and the Englishman is allowed to cut in and punishes Newcastle with a curled finish into the far corner. He scored an own-goal in Newcastle's 2-1 loss to Chelsea last weekend.
Newcastle hung in there, however, and equalised on the half-hour mark with a well-worked goal.
Bernardo Silva sent a delightful pass to Sergio Aguero and his cross saw Martin Dubravka make a remarkable point-blank saves from Fernandinho before twice denying David Silva on the rebound. The physical battle with John Stones and Aymeric Laporte was one to relish and some wonderfully astute play created Yedlin's goal.