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Premier League leaders Arsenal take on a Chelsea side who have not beaten them since August 2021. BBC Sport examines some of the key themes before Sunday's match (16:30 GMT).
More capital gains for Gunners?
After losing ground in the title race with back-to-back draws, Arsenal regained momentum by beating Tottenham 4-1 last weekend – their biggest victory away to their north London rivals since 1978.
The win extended their excellent run of results in derby matches. The Gunners have lost just one of their previous 25 Premier League matches against sides from the capital, and it is a similar story when facing Chelsea.
Arsenal have been beaten in only one of their past 15 meetings with the Blues in all competitions and have won seven and lost none of the 10 most recent encounters.
Mikel Arteta's side now have 10 games left as they look to secure a first league title since 2004. Sunday's fixture is one of just two against sides currently in the top six, along with a potentially decisive trip to second-placed Manchester City on 18 April.
Arteta has a full week to prepare his side for this match, a rare luxury in an increasingly congested calendar. The last time the Gunners had no midweek action was in mid-December.
Familiar failings again costly for Chelsea
Chelsea's 1-1 draw with Burnley followed a frustratingly familiar script for the west London side.
Having surrendered a two-goal lead in the draw with Leeds earlier this month, the Blues again faltered versus newly promoted opposition, conceding an injury-time equaliser from Burnley's Zian Flemming.
They have already dropped 19 points from winning positions this season - the second-highest figure in the top flight prior to the latest round of matches.
Another costly habit has been losing players to red cards at key moments. Chelsea did not allow Burnley a shot on target while they had 11 men on the pitch but understandably looked more vulnerable once Wesley Fofana was sent off in the 72nd minute.
The Frenchman became the eighth Chelsea player to be dismissed this season in all competitions, comfortably the highest total of any Premier League club.
And while Fofana's red was the first since Liam Rosenior's appointment last month, the Blues will need to tread carefully against Arsenal, having had Moises Caicedo sent off in November's 1-1 draw between the sides.
