Deposed world number one Novak Djokovic suffered a scare at the hands of Austrian debutant Dominic Thiem before launching his bid for a fifth successive ATP World Tour Finals title with a 6-7(10) 6-0 6-2 victory on Sunday.
Knocked off the summit he had occupied for 122 weeks by Andy Murray last week, Djokovic must better his British rival's performance at London's O2 Arena to snatch back the top ranking, but things did not go entirely to plan.
Djokovic, bidding to end the year ranked number one for the fifth time in six seasons, trails Murray by 405 points in the standings but Murray will lose the 275 points he gained for winning the Davis Cup for Britain last year.
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