London: Chelsea sent out an emphatic Barclays Premier League title warning as Jose Mourinho's side stunned Swansea by winning 5-0 at the Liberty Stadium.


Costa two good: Chelsea striker Diego Costa (right) gets past Swansea City goalkeeper Lukasz Fabianski (in yellow) to score his second goal during their English Premier League match at the Liberty Stadium in Swansea, Wales on Saturday. Pic/AFP 

Oscar and Diego Costa both scored twice inside the first 36 minutes as leaders Chelsea opened up a five-point gap on nearest challengers Manchester City, who welcome Arsenal to the Etihad Stadium on Sunday, and substitute Andre Schurrle completed the rout late on as Swansea suffered their worst home defeat for 24 years.