Chelsea maintained their 100 per cent record at the top of the Premier League table as they won 3-1 at rock-bottom West Ham, who have yet to pick up a point this season.
Michael Essien headed home a Didier Drogba corner to give the Blues an early lead, before Robert Green spilled a Drogba shot and the rebound went into the net off Salomon Kalou.
Essien added a late third, before Scott Parker netted for the home side and denied the Blues a fourth consecutive clean sheet.
Arsenal overcame Bolton Wanderers 4-1 at the Emirates Stadium, thanks to goals from Laurent Koscielny, Marouane Chamakh, Alex Song and Carlos Vela - Johan Elmander netted the lone reply for the Trotters, who also had Gary Cahill red-carded.
Blackpool are up to fourth in the table after a 2-0 win at Newcastle United, with DJ Campbell netting a clincher after Charlie Adam broke the deadlock from the penalty spot right on half-time.
Blackburn Rovers held Manchester City to a 1-1 draw at Eastlands - Nikola Kalinic's opener for the visitors cancelled out by Patrick Vieira.
A Moussa Dembele double gave Fulham a 2-1 victory at home to Wolves, who finished the game with ten men after Christophe Berra was dismissed.
West Brom held Spurs to a 1-1 draw at The Hawthorns, with Chris Brunt cancelling out Luka Modric's goals for the visitors.
The meeting of Wigan Athletic and Sunderland at the DW Stadium ended 1-1, with Antolin Alcaraz's late effort rescuing a point for the home side.
Debutant Asamoah Gyan had earlier given the ten-man Black Cats the lead, after Lee Cattermole had been sent off against his former club.