Serb wins round-robin match 7-6 (4), 6-7 (1), 6-3 in TurinJannik Sinner makes winning start against Stefanos Tsitsipas
Novak Djokovic ensured he will finish the year ranked world No 1 for an eighth time after battling to a late-night victory over Holger Rune in his opening match at the ATP Finals.
Djokovic is chasing a record seventh title but again found the 20-year-old Rune, who is making his debut at the eight-player event, a troublesome opponent before pulling off a third win in five meetings.
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