Cesc Fabregas helped Chelsea to a satisfying win over his former side Arsenal, confirming the Blues status as title favourites.
The ex-Barcelona midfielder provided the assist for Diego Costa's second, which killed the game off late in the second half.
Fabregas had originally expected to rejoin Arsenal in the summer, only for Arsene Wenger to shy away from bringing his former star back.
Wenger felt the talent at his disposal already - including star signing Mesut Ozil, meant that there was no need to sign his former protege.
For years the Spaniard was regarded as an Arsenal man, even when at Barcelona, the prospect of him playing for another English side appeared unthinkable, despite rumours linking him to Manchester United.
After the game, Fabregas moved to console his old teammate Jack Wilshere, but the Englishman was in no mood to talk.
Wilshere could barely look at Fabregas as the pair made their different routes towards the dressing rooms after the game.
Injury to Aaron Ramsey exposed Arsenal's lack of real quality depth in midfield, they certainly lacked the influence of a Fabregas in terms of creating a cutting edge.
He now has seven assists this season in the Premier League, remarkably the same number as Arsenal's entire midfield.