Chelsea's eighth consecutive Premier League win cemented their place at the top of the EPL table. However, the victory at Etihad Stadium ended in confusion as Manchester City's saw two of their players, Aguero and Fernandinho sent off in injury time.
Antonio Conte's side sent an impressive statement of intent as they cut City apart after halftime. Chelse went into the break a goal down as a result of Cahill's own goal on the stroke of half-time when he diverted Navas' simple cross beyond keeper Courtois.
The game turned on De Bruyne's 56th-minute miss when City were in control, crashing Navas' cross against the crossbar from inside the six-yard box.
Chelsea were level on the hour when Diego Costa outmuscled Otamendi to score. Chelsea went ahead 10 minutes later when substitute Willian raced clear to beat City keeper Bravo with ease.
Eden Hazard completed the magnificent performance and victory for Chelsea with another classic goal on the counter attack, showing too much pace for Kolarov to wrap up three valuable points for the team.