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Roger Federer remains on course for a seventh ATP Tour Finals title after the defending champion defeated third seed Andy Murray 7-6 (7/5), 6-2 last night to set up a final showdown with Novak Djokovic.
Federer cruised past Murray in one hour and 33 minutes at London's O2 Arena and the Swiss great is now one win away from completing a hat-trick of titles at the prestigious season-ending event.
Earlier, Del Potro was on the verge of a shock win over Djokovic when he led by a set and a break, but the world number one hit back in impressive fashion to win 4-6, 6-3, 6-2
