Djokovic, the World No 2 beat seventh-ranked Berdych 6-4, 7-6 (7/5), 6-2 in two hours and 41 minutes for his 24th victory in a row. Serbia’s Dusan Lajovic was to take on Radek Stepanek of the Czech Republic in the decisive fifth rubber on the hardcourts of a sold-out Belgrade Arena at the time of going to press.

Novak Djokovic reacts after beating Tomas Berdych at the Kombank Arena. Pic/AFP