The result sees City move level on points with Arsenal in second place, while United remain in sixth.
Arsenal made late attempts to probably steal a comeback win, but Chelsea were able to absorb the late pressure.
Arsenal extended their perfect start this season with a crucial win at the Emirates Stadium, snatching a first win against City since 2015.
The four-goal thriller game ended 2-2 with both teams sharing points at the Emirates.
Jonny Evans, who was making his first United start after eight and half years, provided Fernandez with the assist for the goal from the middle of the pitch.
With 75 per cent ball possession and four shots on target, the Gunners put up a brilliant performance and earned a deserved win.
Mike Arteta’s side returned to winning after a poor draw against Fulham last week.
With his brilliant performance and contributions last season, Saka, 21, clinched this year’s edition of the award after three previous nominations.
However, Martin Odegaard put Arsenal ahead, converting a penalty in the 53rd minute after Sam Johnstone brought Eddie Nketiah down in the box.
Nketiah opened scoring for the Gunners courtesy of an assist from Gabriel Martinelli 26 minutes into the game.
