Head-to-head for Chelsea vs Arsenal

-Arsenal's 3-1 win the last time the two sides met, at the Emirates in December 2010, was their first in six games against Chelsea.
-Chelsea have lost just three of their last 19 games in all competitions against the Gunners.
-Arsenal have lost their last two Premier League visits to Stamford Bridge - both by a 2-0 scoreline.

Chelsea

-Chelsea have gone eight Premier League games without a clean sheet for the first time since September 2003, when the run was nine.
-They are unbeaten in their last 10 Premier League home London derby matches, winning each of the last nine. Their last loss was a 2-1 defeat to Arsenal in November 2008.
-Andre Villas Boas's side have won all four Premier League home matches this season.
-Since making his debut in February, David Luiz has conceded more penalties (3) than any other Premier League player.
-Chelsea's next goal will be their 6,000th in league football.
-Ashley Cole, who has played every minute of Chelsea's Premier League games this season, is set to make his 450th club career start.

Arsenal

-Arsenal are on a run of eight away league games without a win - their longest in the Premier League.
-Robin Van Persie has 25 goals in 26 Premier League games in 2011 - more prolific than any other player.
-If Arsenal lose it will equal their worst run of away defeats (4) in the Premier League.
-The Gunners' win against Stoke was the first time they have collected back-to-back victories in the Premier League since February.
-This will be Wenger's 30th Premier League match against Chelsea, having won 13 and lost seven of the previous 29.
-The Gunners have conceded more goals from free-kicks (5) than any other Premier League side this season.