Premier League: Costa hat-trick downs Swansea

Chelsea's Diego Costa continued his stunning start to life in the Premier League with a hat-trick in a 4-2 comeback victory over Swansea City on Saturday while Manchester City's Martin Demichelis grabbed a late leveller in a 2-2 draw at Arsenal.

Costa, who now has seven goals from his first four games, helped Chelsea come out on top against the only other team with a 100 percent record, after Swansea had taken the lead with an early own goal from John Terry.

New signing Loic Remy grabbed his first Chelsea goal before Jonjo Shelvey netted a consolation late on, leaving Chelsea three points clear at the top of the table and five ahead of title rivals Manchester City.