Update: 8:00AM Chelsea overcame a difficult first half to beat Tottenham Hotspur 4-0 on Saturday and move seven points clear at the top of the Premier League.
Liverpool remain second, level with Arsenal who have a game in hand, with Manchester City, who have three games in hand, now nine points off the top.
Tottenham, playing an unfamiliar formation with Kyle Walker in midfield, started well but were undone after 55 minutes when Jan Vertonghen slipped and, under pressure, attempted to hook a backpass to his goalkeeper.
Samuel Eto'o pounced to beat Hugo Lloris and register his 300th goal in club football.
Three minutes later Chelsea had a second as Younes Kaboul was harshly sent off for barging Eto'o as he looked to get on the end of Eden Hazard's cross. The Belgian converted the penalty.
Demba Ba added two late goals in quick succession to give the scoreline a flattering aspect.
Earlier the pressure intensified on beleaguered West Bromwich Albion manager Pepe Mel as his side were beaten 3-0 at home by Manchester United.
"I thought Robin van Persie and Wayne Rooney were excellent," said United boss David Moyes. "Juan Mata and Adnan Januzaj too, but we also needed a good defensive performance as well so, all round, I'm pleased."
West Brom remain fourth bottom of the table, but have played two games more than the sides immediately below them, Cardiff City and Sunderland.
"I don't know that (if I will be replaced), it doesn't depend on me," said Mel.
"I'm very pleased with the performance of the players and very proud of the performance.
"The next four games are very, very important for the club, starting with Swansea, and now we have to recuperate the team."
Cardiff City moved up to third bottom with a 3-1 win over bottom side Fulham and Crystal Palace remain in trouble after going down 1-0 at home to Southampton.
Norwich City are just four points clear of the relegation zone after a 1-1 draw at home to Stoke City.