Jannik Sinner edged towards becoming the first ever Italian to reach the last four of the ATP Finals on Tuesday after a thrilling 7-5, 6-7 (5/7), 7-6 (7/2) win over Novak Djokovic. World number four Sinner needed a straight-sets victory in front of enthusiastic home support in Turin over tennis icon Djokovic to guarantee passage from the Green Group with a match to spare. And while the 22-year-old couldn't quite make that happen, a superb performance gave him his first win in four attempts over Djokovic, who is bidding to win for a record seventh time at the year-ending tournament.