London - Both Chelsea and Manchester City capitalised on Liverpool's shock defeat by Hull on Sunday to leapfrog the Merseysiders and close the gap on Premier League leaders Arsenal.
Chelsea recovered from conceding a goal inside the first minute at Stamford Bridge, when Jay Rodriguez pounced on a poor backpass from Michael Essien, to beat high-flyers Southampton 3-1.
Second-half goals from central defenders Gary Cahill and John Terry, on his 400th league appearance, put Chelsea in front before substitute Demba Ba sealed victory with a 90th minute effort.
The win took Chelsea, now in second place, to within four points of Arsenal while City, who went third, were six points adrift of the leaders after another impressive home display saw Swansea beaten 3-0.
Samir Nasri scored twice after Alvaro Negredo broke the deadlock in just the eighth minute at Eastlands.
Earlier, Hull beat Liverpool for the first time in their history with a 3-1 win at the KC Stadium.
Liverpool started the match in second place but this result dropped them to third, even before Chelsea had kicked-off and City's win meant they finished the day in fourth place.
Hull took a 20th minute lead when Jake Livermore, on loan from Tottenham Hotspur, scored his first Premier League goal with a deflected 25-yard shot
But Liverpool were level seven minutes later when England captain Steven Gerrard swept in a 20-yard free-kick.
Hull though put the result beyond doubt with two goals inside the final 20 minutes, David Meyler capitalising on a defensive lapse by Kolo Toure before Liverpool's Martin Skrtel turned Tom Huddlestone's shot into his own net.
"It is always nice to turn over Liverpool, but it was the response after the loss to Crystal Palace that pleased me," said Hull manager Steve Bruce.
Reds boss Brendan Rodgers said Liverpool had suffered from being without injured leading goalscorer Daniel Sturridge.
"There were too many mistakes and with the ball we didn't create enough," said Rodgers.
"There is no doubt that we miss a player of Daniel Sturridge's quality and we do not have a squad that is big enough to cope with his absence."
The victory united, at least temporarily, Hull owner Assem Allam and those fans of the club unhappy at his intention to change its official name from Hull City AFC to Hull Tigers.
This has prompted chants of "City till we die" at home games from some Hull fans.
Egyptian businessman Allam, in a controversial interview published just hours before the Liverpool match, told the Independent on Sunday: "I don't mind 'City till we die'.
"They can die as soon as they want, as long as they leave the club for the majority who just want to watch good football."
But a rather more conciliatory Bruce said: "I think that this club would not be here without the owner. I am happy to speak to the owner and give him my opinion but as I said earlier, if he wants us to play in pink fairy dresses then he is entitled to that view."
Earlier, champions Manchester United needed two goals from Wayne Rooney to help them twice come from behind in a 2-2 draw away to Tottenham.
Spurs went ahead through a Kyle Walker free-kick and then made it 2-1 thanks to a stunning strike from Sandro.
But Rooney hit back on both occasions, although the draw left United nine points adrift of Arsenal.
"We're concerned that we're not as close as we'd like to be but it's a long season," said David Moyes, given the daunting task of succeeding Alex Ferguson as United manager following the Scot's retirement last season.
"Hopefully we'll be there or thereabouts."