Striker Berbatov was denied by a last-ditch tackle from Gael Givet and then he nodded down Valencia's curling cross from the right, but Paul Robinson was equal to it and tipped it over the bar.
Right from the start, Chelsea looked off key and when skipper John Terry failed to head away Paul Konchesky's cross, Gera was on hand to hook the ball in after Bobby Zamora had nodded it his way.