Switzerland's Roger Federer celebrates winning his ATP World Tour Finals men's singles tennis match against South Africa's Kevin Anderson at the O2 arena in London, Thursday, Nov. 15, 2018. (John Walton/PA via AP)
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Alexander Zverev set up a last-four clash against Roger Federer in the ATP Finals after seeing off John Isner 7-6 (7/5), 6-3 on Friday while Novak Djokovic will take on Kevin Anderson.Zverev played American giant John Isner at London's O2 Arena knowing a win by any score line would take him through to the semi-finals of the season-ending tournament.The players swapped mini breaks but the giant Isner then faltered again on his own serve to hand the set to Zverev – meaning he no longer had any chance to qualify for the last four.In the second set a single break of serve in the eighth game proved decisive as Zverev served out the match.Zverev is the youngest semi-finalist at the ATP Finals since Juan Martin del Potro in 2009 .
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