Chelsea reclaimed their three-point lead at the top of the Premier League table after a hard-earned 2-1 win over bottom side Portsmouth on Wednesday.
Nicolas Anelka's first-half strike and a second-half penalty from Frank Lampard secured the first win in five matches for Carlo Ancelotti's side and ensured it was an unhappy return to Stamford Bridge for former Chelsea boss Avram Grant, now the manager of Portsmouth.
Arsenal's hopes of catching the leaders suffered a setback when they were held to a 1-1 draw at Burnley, but it was a better night for Tottenham, who claimed an emphatic 3-0 win over Manchester City.
Liverpool bounced back by defeating Wigan 2-1 at Anfield.
David Ngog gave Liverpool an early lead against Wigan in the 10th minute and should have doubled just before the break but fired narrowly wide. It was not until Fernando Torres came off the bench and scored with 11 minutes left that the points were safe, though Charles N'Zogbia's injury-time effort ensured nervous moments.