Manchester City claimed a 2-0 win over Leicester City to move 17 points clear at the top of the Premier League standings.
Sergio Aguero, who will depart City at the end of the season, was hauled in up top alongside Riyad Mahrez and Kevin De Bruyne with goalkeeper Ederson Moraes back between the sticks.
The Citizens took the lead in the first five minutes through a stupendous volley from Fernandinho, but it was disallowed for offside as Aguero unsighted goalkeeper Kasper Schmeichel.
The Foxes also had the ball in the net on the cusp of halftime when Jamie Vardy rounded Ederson following a through ball from Ayoze Perez to slot home, but the flag went up for offside.
However, the Citizens emerged for the second half gunning towards the opener through a promising free-kick but neither Ruben Dias nor Rodri capitalised.
City made the breakthrough 12 minutes from the break when Benjamin Mendy picked up a loose ball in the area, pulled a cutback before picking out the bottom-corner.
Aguero’s stay was cut short midway in the second half and had Raheem Sterling coming on as his replacement.
The Citizens increased their advantage towards the last ten minutes through Gabriel Jesus, who collected a reverse pass from substitute Sterling to apply a smart finish.
Leicester looked to stage a comeback in the closing period, but the Citizens ran down the clock to bag the victory.
Chelsea had a day to forget at Stamford Bridge after suffering a 5-2 loss to relegation-threatened West Bromwich Albion on Saturday afternoon.
After a frustrating opening, Pulisic broke the deadlock in the 27th minute with a strike from a rebound after goalkeeper Sam Johnstone tipped Marcos Alonso's free-kick into the post.
Thomas Tuchel's charges were reduced to ten men a minute later after Thiago Silva got a second yellow card and was sent of for a lunging late tackle on Okay Yokuslu on the edge of the box.
West Brom had the momentum after that and Matheus Pereira levelled matters in first-half stoppage time with a lobbed volley over shot-stopper Edouard Mendy, who was out of his area after a long ball from Johnstone.
Pereira eventually gave the visitors the lead going to the break and grabbed his brace with a low strike towards the bottom corner after a good passing move inside the box.
The Blues were spirited coming from the break and Alonso came close to getting the equaliser nine minutes inside the second stanza with a close range half-volley that deflected into the base of the post by Semi Ajayi, with Johnstone out of his area.
With Chelsea were leaving spaces behind going forward in numbers, they were punished in the 63rd minute after Callum Robinson made it 3-1 with a first-time volleya after a cross by Darnell Furlong.
Sam Allardyce's troops had their tails up and Mbaye Diagne made it 4-1 with a side-footed shot on the far side of the box across into the bottom corner after a cut-back by Pereira.
Mason Mount gave the Blues hope of a comeback after getting the second goal back with a tap-in into a gaping net from close range after he was teed up by Timo Werner.
Robinson made it 5-2 for West Brom in stoppage time with a chip over Mendy in a one-on-one situation after a through ball and the Baggies reduced the deficit behind Newcastle United to seven points while Chelsea remained in fourth place but in danger of losing that position.
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