LONDON (AP) -- Chelsea finally seems to have found the solution to its striking struggles. Diego Costa took his goal haul to seven in four matches with a hat trick against Swansea on Saturday while Loic Remy also scored on his debut.
The 4-2 victory was Chelsea's fourth win in four matches this season and ended Swansea's perfect start to the Premier League season.
Costa, who joined from Atletico Madrid for more than $50 million in July, is the first Chelsea player in 86 years to score in his first four games.
But there was no debut goal for Arsenal striker Danny Welbeck in a 2-2 draw with champion Manchester City.
Southampton claimed the biggest victory of the day, a 4-0 rout of Newcastle that makes manager Alan Pardew's future look increasingly precarious.