Djokovic edges Murray in thriller

Novak Djokovic fought back from a set down to earn his fourth win of 2012 over Andy Murray and move closer to the ATP World Tour Finals' last four. The Serb won 4-6 6-3 7-5 at London's O2 Arena, keeping the world number one top of Group A in the round-robin stage. Djokovic will qualify for the semi-finals if Jo-Wilfried Tsonga beats Tomas Berdych in the late match at 19:45 GMT. Murray's fate will be decided in Friday's final group match with Tsonga. The Briton beat Djokovic win his first Grand Slam title at the US Open in September but had since lost an epic final in Shanghai to the Serb.