Diego Costa made a decisive return to the Chelsea line-up as the striker helped his side to a comfortable victory over struggling Hull City.
Tigers midfielder Ryan Mason was taken off on a stretcher after a nasty clash of heads with Gary Cahill, which led to nine minutes of first-half stoppage time.
And Costa made sure the Blues would go into the break with the lead after getting on the end of Victor Moses' clever pull-back to fire home the opener in the seventh minute of added time.
Gary Cahill made sure of the victory with an 81st minute header, with Antonio Conte's men now eight points ahead of second-place Arsenal.