Manchester City avoided a scare after Ogbonna gave West Ham a shock lead. Guardiola's men looked somewhat unconvincing in the first half but showed great resilience after the break, sealing the comeback seven minutes from the final whistle.
Pep Guardiola's Manchester City have looked unstoppable at the start of the season, with the former Barcelona coach instilling his passing style on the team. It is quite apparent that their performances rely greatly on keeping the ball.
But possession isn't everything in football, and that is what West Ham proved in the first half at the Etihad. David Moyes drew up a game plan to visit the league leaders and he stuck to it, much to the home supporters' early fustration.
The Citizens did start the fixture on the front foot and predictably pinned West Ham inside their own half, but they were unable to get in behind the deep back line. City knocked the ball around the edge of the area, but their passing lacked the intensity to breach the Hammers' defence.
Against all odds, West Ham had the first big chance of the game when Cresswell's in-swinging corner was flicked on by Kouyate and Antonio could only divert it over the bar despite running into the back post unmarked.
The hosts were restricted to a single shot off target in the first 20 minutes before David Silva tested Adrian with a long-range effort. His fierce strike took a wicked deflection, forcing the Spanish goalkeeper to tip it over the bar. Other than that, the hosts failed to pose a real threat in the remainder of the first half.
Another rare chance came the Hammers' way when the ball was played through to Lanzini in the area and Ederson scrambled his pot-shot wide. With the home crowd growing restless with City's out of sorts performance, West Ham stunned the Etihad at the stroke of half-time.
Cresswell's cross from the right found Ogbonna and the defender powered a header into the bottom corner to put the Hammers in front. City had possession, while West Ham had the chances. On the balance of play, the goal was deserved.
West Ham capitalised on an altogether lethargic and complacent display from the hosts, but Guardiola's half-time team talk seemed to have the desired effect as they ominously built up pressure on the Hammers after the break, when Moyes' side began to look leggy for the first time in the game.
City's insistence finally paid off, as gaps began to appear in the visitors' defence. De Bruyne forced a couple of decent saves from Adrian but the Spaniard could do nothing to keep out Otamendi's close-range effort after Gabriel Jesus cut the ball back into the middle of the six-yard box.
Following the equaliser, the goalkeeper was kept busy with Sane growing in influence. The German winger was denied on a couple of occasions before a flurry of chances saw Adrian play a stellar role. De Bruyne and Jesus saw their efforts pushed away as the Hammers held on for dear life.
The Citizens finally undid West Ham's resistence when De Bruyne pinged a delightful pass towards the back post for Silva to stretch and volley back across goal and into the bottom corner. The creative Spaniard, who extended his contract until 2020 earlier this week, repaid the club for their show of faith.
The Hammers capitulated as City began to wind the clock down, securing a 13th successive Premier League win to maintain the eight-point gap with United ahead of next week's Manchester derby.