Diego Costa's 10th goal of the season moved Chelsea top of the Premier League after a dominant win over Middlesbrough at the Riverside Stadium.
After an even start, Chelsea upped the tempo and deservedly led at the break when Costa reacted quickest to drill in a loose ball inside the Boro box.
The Blues continued to create chances, Pedro going closest when he smacked a rising drive against the crossbar.
Boro's best chance came when Alvaro Negredo's 78th-minute volley was saved.
It was the only time the home side forced Blues keeper Thibaut Courtois into a serious stop as they lost for the first time in four matches.