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Former world number one Novak Djokovic beat second seed Stefanos Tsitsipas in two tight sets in his opening match of the ATP Finals in Turin.<\/span><\/p>\n The 35-year-old Serb overcame Tsitsipas of Greece 6-4 7-6 (7-4).<\/span><\/p>\n<\/div>\n Djokovic is seeking to equal Roger Federer’s record of six victories in the season-ending tournament.<\/span><\/p>\n Earlier in the same group, Russian Andrey Rublev came from a set down to beat compatriot Daniil Medvedev 6-7 (7-9) 6-3 7-6 (9-7).<\/span><\/p>\n Rublev, seeded sixth, held his nerve in a final-set tie-break to overcome the fourth seed after squandering seven set points in the opening set.<\/span><\/p>\n On Sunday, Rafael Nadal’s latest bid to finally land the first ATP Finals title of his career started with a defeat by American eighth seed Taylor Fritz.<\/span><\/p>\n Top seed Nadal will face Canadian Felix Auger Aliassime in his second Green Group round-robin match on Tuesday.<\/span><\/p>\n The Turin tournament sees eight of the year’s best men’s players split into two groups of four, with the top two qualifying for the semi-finals.<\/span><\/p>\n Meanwhile, Great Britain’s Neal Skupski and Dutch partner Wes Koolhof won their first men’s doubles match 7-6 (7-3) 4-6 10-5 against Australian duo Nick Kyrgios and Thanasi Kokkinakis.<\/span><\/p>\n The pair have enjoyed incredible success in their first year together, winning seven titles which have included Masters 1000 victories in Madrid, Montreal and Paris, and finishing 2022 as year-end world number ones.<\/span><\/p>\n Former world number one Joe Salisbury, seeded second with American Rajeev Ram, will face fellow Brit Lloyd Glasspool and his Finnish partner Harri Heliovaara on Tuesday.<\/span><\/p>\n