Updated On: 10 November, 2012 03:47 AM IST | | AFP
Novak Djokovic advanced to the semi-finals of the ATP Tour Finals with a 100 percent record as the World No 1 defeated Czech fifth seed Tomas Berdych 6-2, 7-6 (8/6) at London's O2 Arena yesterday.
Djokovic had already defeated Andy Murray and Jo-Wilfried Tsonga in his previous Group A matches and the Serb knew he needed only to win one set against Berdych to be sure of qualifying.

Djokovic celebrates his win over Berdych yesterday. Pic/AFP.