Soccer - Costa's return to form gives Chelsea new momentum in title bid

Britain Football Soccer - Chelsea v Southampton - Premier League - Stamford Bridge - 25/4/17 Chelsea's Diego Costa celebrates scoring their fourth goal Reuters / Stefan Wermuth Livepic

LONDON (Reuters) - The central role that Diego Costa played in Chelsea's 4-2 win over Southampton on Tuesday suggests the Premier League leaders are going into the season's climax firing on all cylinders again.

Costa broke a run of five league games without a goal as he scored twice in the second half against the Saints, racking up his 50th and 51st Premier League strikes for the Londoners.