Chelsea took sole possession of first place in the Premier League table after they beat Newcastle United 2-0 on Saturday and Manchester City drew 1-1 at Everton.
Chelsea began the day dead-level with City, but with the defending champions dropping points for only the second time in 10 matches, Jose Mourinho's side moved two points clear.
Chelsea took the lead in the 41st minute when Oscar tapped in Branislav Ivanovic's cross after Willian took a quick corner and they went on to add a delightfully constructed second goal just before the hour, with Diego Costa gathering a clever back-heel from Oscar and drilling in his 15th goal of the campaign.
At Goodison Park, City went ahead in the 74th minute when Fernandinho helped a shot from David Silva over the line with his head, but Steven Naismith equalised four minutes later, glancing home a cross from Leighton Baines.
Tottenham Hotspur can move into the top four if they win at Crystal Palace later on Saturday, with third-place Manchester United and fourth-place Southampton facing off at Old Trafford on Sunday.
West Ham United spurned a chance to climb to fifth place after being held to a 1-1 draw at Swansea City. Andy Carroll put West Ham ahead in the 43rd minute with a fine effort, chesting down a high ball and then dancing across the box before slamming a left-foot shot into the top-right corner from 15 yards.
But Swansea equalised in the 74th minute when a header from France striker Bafetimbi Gomis hit the post, struck West Ham midfielder Mark Noble and rebounded into the net for an own goal.
Burnley climbed out of the relegation zone and dragged Queens Park Rangers into the bottom three with a 2-1 home win over Harry Redknapp's side. Scott Arfield's opener was cancelled out by a penalty from former Burnley striker Charlie Austin, but Danny Ings gave the hosts victory in the 37th minute by rolling the ball past Rob Green after a neat piece of control.
Bottom club Leicester City closed to within two points of safety by winning 1-0 at home to Aston Villa, with Paul Konchesky slamming in the only goal in first-half stoppage time.
In his first league game as manager, Tony Pulis saw West Bromwich Albion climb to 14th after Saido Berahino's 78th-minute goal secured a 1-0 home win over Hull City.