Chelsea vs Arsenal

The 143rd London league derby between Chelsea and Arsenal brings together two clubs who have won the Premier League title five times between them, but Chelsea's pair were subsequent to Arsenal's three. Indeed the Stamford Bridge club have not finished outside of the top two in five seasons, while the Gunners have not finished inside the top two in three years.
The Blues go into this match unbeaten in five and top of the table, some 10 points ahead of Arsenal, who've failed to win four of the last five and are scrapping to retain their top four status.
Arsenal sailed into the last 16 of the Champions League this week; stuttering Chelsea are yet to do so. They are two of the top three highest scorers in the Premier League. The Blues are chasing a fourth home win of this top-flight campaign, the Gunners a fourth away maximum.
Arsenal cross the capital in danger of suffering three successive league losses for the first time in 59 Premier League outings, since tumbling to Everton (a), Liverpool (a) and West Ham (h), between 18 March and 7 April 2007.
Chelsea complete their home fixtures against fellow 'Big Four' clubs, having already lost to Liverpool and been held by Manchester United at the Bridge. Arsenal have met one fellow 'Big Four' club so far; beating Manchester United at the Emirates Stadium.
Arsenal have won one of the last 12 meetings with Chelsea in all competitions.
Chelsea have lost more games (15), conceded more goals (47) and dropped more points (67) to Arsenal, than to any other club in the Premier League.