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ATP Finals: Tsitsipas stuns Federer to reach final

London (CNN)For the second straight year, Roger Federer was undone by a 21-year-old in the semifinals at the ATP Finals, much to the disappointment of the overwhelming majority of the 18,000 fans inside London's O2 Arena. Alexander Zverev knocked out the legendary Swiss 12 months ago en route to the crown, and on Saturday it was the turn of Stefanos Tsitsipas. He became the youngest finalist on his ATP Finals debut since Hall of Famer Jim Courier in 1991. The Greek talent won a gargantuan ninth game of the opening set as part of a 6-3 6-4 victory over tennis' best supported player, a day after Tsitsipas fell in an extended thriller against another of the game's behemoths, Rafael Nadal. Awaiting him on Sunday is Dominic Thiem, who ended Zver ...