Reigning champions Manchester City moved top of the Premier League for the first time this season with a dominant win over struggling Watford.
Raheem Sterling headed City ahead after only four minutes, when free at the back post to meet Phil Foden's excellent cross from the left.
The hosts were repeatedly ripped apart by City's movement, passing and creativity and only a number of saves from goalkeeper Daniel Bachmann kept the score down to one goal in the first 30 minutes.
But City got a well-deserved second as Bachmann denied Ilkay Gundogan, but the rebound fell to Bernardo Silva, who showed excellent skill to beat two defenders and finish well from a tight angle.
Silva then grabbed his second and City's third, cutting in from the right side of the penalty area and curling a fine finish past Bachmann.
Cucho Hernandez pulled one back for Watford, following in to convert a rebound after his first strike had hit the foot of the post.
After 15 matches, City - title winners in five of the past 10 seasons - are a point ahead of Liverpool.
Chelsea began the day as leaders, but are now a point behind the Reds in third place, after losing 3-2 to fourth-placed West Ham.
Six points from eight games under Ranieri
For Watford, this was a sixth defeat in eight matches under Claudio Ranieri, albeit from an incredibly tough run, including encounters against five of the current top seven.
They performed excellently to win 5-2 at Everton and 4-1 against Manchester United in Ole Gunnar Solskjaer's last match in charge of the Red Devils, but have only picked up six points since Ranieri replaced the sacked Xisco Munoz in October.
Ranieri received a hero's reception at Leicester last Sunday in a return to the King Power Stadium where he had led the Foxes to the Premier League title in 2015-16.
But, just as in that match where they lost 4-2, the Hornets' defensive problems were on display and only fine goalkeeping from Bachmann denied City a hatful of first-half goals.
Goalscorer Sterling also had another effort saved, Jack Grealish - back in the starting line-up for the first time in a month after injury - was denied three times and Joao Cancelo fired wide as Watford were outclassed.
After Silva doubled the visitors' lead in the 31st minute it became a question of how many City would score.
Sterling is now on 99 Premier League goals and had a chance to reach his century, but had an effort palmed away by Bachmann, who also fingertipped a Foden drive onto the post.
The chances kept coming for City with Gundogan shooting over, before Silva's second goal - and seventh of the season - came in the 63rd minute.
Grealish also had a strike deflected onto the crossbar, Bachmann saved from Aymeric Laporte, before substitute Hernandez claimed Watford's consolation in the 74th minute.
Player of the match
Bernardo SilvaBernardo Silva
Line-ups
Watford
Formation 4-1-4-1
26Bachmann
21Femenía5Troost-Ekong15Cathcart3Rose
6Louza
25Dennis8Cleverley19Sissoko10João Pedro
7King
26Bachmann21Femenía5Troost-Ekong15CathcartBooked at 85mins3RoseBooked at 31minsSubstituted forNgakiaat 71'minutes6LouzaSubstituted forHernándezat 45'minutes25Dennis8CleverleySubstituted forKuckaat 45'minutes19Sissoko10João Pedro7KingBooked at 7minsSubstitutes
2Ngakia16Gosling17Fletcher18Tufan27Kabasele29Hernández33Kucka35Elliot42MorrisMan City
Formation 4-3-3
31Ederson
2Walker3Rúben Dias14Laporte27Cancelo
8Gündogan16Rodri20Bernardo Silva
7Sterling10Grealish47Foden
31Ederson2Walker3Rúben Dias14Laporte27Cancelo8GündoganSubstituted forDe Bruyneat 67'minutes16Rodri20Bernardo Silva7Sterling10GrealishSubstituted forMahrezat 68'minutes47FodenSubstituted forGabriel Jesusat 75'minutesSubstitutes
5Stones6Aké9Gabriel Jesus11Zinchenko13Steffen17De Bruyne25Fernandinho26Mahrez33CarsonReferee:Simon HooperAttendance:20,673Live Text
Match ends, Watford 1, Manchester City 3.
Second Half ends, Watford 1, Manchester City 3.
Attempt missed. Jeremy Ngakia (Watford) right footed shot from outside the box misses to the right. Assisted by Cucho Hernández with a cross following a corner.
Corner, Watford. Conceded by Rúben Dias.
Corner, Watford. Conceded by Kevin De Bruyne.
Attempt saved. João Cancelo (Manchester City) right footed shot from outside the box is saved in the centre of the goal. Assisted by Kevin De Bruyne.
Foul by Bernardo Silva (Manchester City).
Cucho Hernández (Watford) wins a free kick on the right wing.
Attempt missed. Kevin De Bruyne (Manchester City) right footed shot from outside the box is just a bit too high. Assisted by Riyad Mahrez.
Craig Cathcart (Watford) is shown the yellow card for a bad foul.
Gabriel Jesus (Manchester City) wins a free kick in the attacking half.
Foul by Craig Cathcart (Watford).
Attempt blocked. Bernardo Silva (Manchester City) right footed shot from the centre of the box is blocked. Assisted by Gabriel Jesus.
Corner, Manchester City. Conceded by William Troost-Ekong.
Attempt blocked. Raheem Sterling (Manchester City) right footed shot from the left side of the box is blocked. Assisted by Bernardo Silva.
Foul by Raheem Sterling (Manchester City).
Kiko Femenía (Watford) wins a free kick in the defensive half.
Attempt missed. Raheem Sterling (Manchester City) right footed shot from outside the box is too high. Assisted by Bernardo Silva.
Attempt missed. Joshua King (Watford) right footed shot from the centre of the box is close, but misses to the right. Assisted by Cucho Hernández with a cross.
Raheem Sterling (Manchester City) wins a free kick in the defensive half.
Our coverage of your Premier League club is bigger and better than ever before - here's everything you need to know to make sure you never miss a moment