Olivier Giroud scored a late consolation for Chelsea, netting a header with five minutes to go, but after the game Maurizio Sarri said he had been anticipating a hard afternoon - and described the Blues' defending as "a disaster".
"We created a lot of chances". The Everton goalless draw at Stamford Bridge just before the worldwide break saw them drop two points and we saw a real lack of creativity and penetration.
City were done and dusted by halftime after Silva, with a flick, Sterling, with an easy finish and Sane, with a superb third, made it 3-0 at the break.
Worryingly for the rest of the league, City manager Pep Guardiola felt his side could have played much better. We were not compact for 90 minutes.
Jurgen Klopp's Liverpool had to be patient at Vicarage Road but were rewarded when Mohamed Salah, Trent Alexander-Arnold and Roberto Firmino scored late goals that subdued Watford.
"It's not a physical problem, because in the last part of the match we have done a lot".
Son should have added a second before Kane did double the lead when he was allowed oodles of space to score with a 25-yard strike that deceived Arrizabalaga.
Sarri on Friday used his pre-match media conference to again play down his side's title chances and promote Manchester City's.
Manchester United are now 14 points off the leaders as Paul Pogba was hauled off by Jose Mourinho as they failed to break down Crystal Palace in a 0-0 draw at Old Trafford. "The objective was to start well this period of eight matches until December".
Antonio Conte, Sarri's predecessor, was sacked in July despite winning the Premier League in his first season and the FA Cup in his second.
Two goals from Aleksandar Mitrovic helped Fulham record their first top-flight win since August to make it a dream first game in charge for Ranieri.
And with Watford pushing for a way back following Henderson's dismissal, Firmino grabbed one of his own to seal victory. "It is a little step but important for the enthusiasm and everything." the Italian said.
Sigurdsson's goal on the hour mark proved enough to move Everton above Manchester United and up to sixth, when he turned in the rebound from Theo Walcott's powerful shot.