Djokovic loses to Thiem to set up Federer clash

Despite winning the first set tie-break, Djokovic was second best to Thiem, who found his form to comeback 6-7 (5-7) 6-3 7-6 (7-5) in a thrilling encounter.The 26-year-old Thiem is competing at his fourth consecutive ATP Finals but had never beaten Djokovic on the hard court before. "This was really one of these special matches, what I've practiced all my life for, all my childhood for," said Thiem."Really epic one in an amazing atmosphere, beating a legend of our game." Defeat for 16-time major winner Djokovic means his next round-robin match against 20-time grand slam champion Roger Federer will now be a straight shootout for the last semifinal place.If he clinches the title, Djokovic would overhaul Rafael Nadal to finish the year as No.1 for a sixth time, equaling the record of American great Pete Sampras. READ: Rafa Nadal angered by 'bullsh**' marriage question

'Great match'

Federer, who also started his campaign with a defeat by Thiem, rallied to beat Matteo Berrettini in straight sets earlier Tuesday to keep his dreams alive of a seventh title at the season-ending finale. The prospect of the two champions battling it out will trigger memories of this year's stunning Wimbledon final in which Djokovic saved two match points to triumph after five breathtaking sets. "We have played a lot of matches since, and I think we both look back at a great match," Federer said, saying the defeat at Wimbledon in July took a couple of weeks to shake off. "I think we both can take away some confidence from the match. Him, obviously a lot. Me, maybe a tad bit less." READ: Roger Federer crashes to opening defeat to Dominic Thiem
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