Juan Mata scored his first goal of the season as Chelsea comfortably beat Arsenal to reach the Capital One Cup quarter-finals.
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Cesar Azpilicueta gave Chelsea a first-half lead on the break from an Arsenal corner, latching on to Carl Jenkinson's poor header back and poking in.
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Aaron Ramsey fired a shot wide from 25 yards as Arsenal struggled to get a grip on the game.
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Mata sealed victory after the hour mark with a sweet strike from 20 yards.
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The Spaniard, who made only his sixth start of the season, was the shining light in a one-sided game where Chelsea demonstrated their superior squad strength to earn their sixth successive triumph.
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Both teams made multiple changes to their teams after the weekend's Premier League action, but Michael Essien and John Obi Mikel bossed midfield with a combination of guile and muscle while Willian and Samuel Eto'o were sharp in attack.
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In a repeat of the 2007 League Cup final - which Chelsea also won - the result marked a second consecutive home defeat for Arsenal, the first time this has happened since February 2013, and reduces their chances of ending their eight-year trophy wait.
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Although it was a largely second-string Gunners side, with Nicklas Bendtner poor up front, the defeat was a worrying sign ahead of a tough run of games that include Liverpool, Dortmund again and Manchester United.
Chelsea FC deserved their victory. It was expected tho i'm not surprised!