Both Chelsea and Manchester City capitalised on Liverpool's shock defeat by Hull City on Sunday to leapfrog the Merseysiders and close the gap on English 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.
Meanwhile City, who went third, were six points adrift of Arsenal after another impressive home display saw Swansea City beaten 3-0.
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
Hull put the result beyond doubt, though, with two goals inside the final 20 minutes, David Meyler netting before Liverpool's Martin Skrtel turned Tom Huddlestone's shot into his own net.
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.