Zverev wins to stop Nadal-Federer semi

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BRITAIN TENNIS ATP WORLD TOUR FINALS

Alexander Zverev reacts after defeating Daniil Medvedev at the ATP World Tour Finals

Defending champion Alexander Zverev reached the last four at the ATP Finals with a 6-4 7-6(4) defeat of Russian debutant Daniil Medvedev on Friday (Saturday AEDT) and consigned Rafael Nadal to an early exit at the same time.

The 22-year-old German served superbly throughout and held his nerve in the second-set tiebreak to notch a second group victory to claim second spot ahead of world No.1 Nadal.

Spaniard Nadal had earlier beaten group winner Stefanos Tsitsipas 6-7(4) 6-4 7-5 in a near three-hour battle to keep his hopes alive, but needed Medvedev to do him a favour by beating Zverev.

Medvedev, 23, dropped his opening service game and never made much of an impression on his opponent's serve.

He double-faulted at 3-4 in the tiebreak to give Zverev a two-point lead and Zverev finished it off with an ace.

While it was a great night for Zverev it was disappointing for those who had hoped to see a Nadal versus Roger Federer semifinal.

Greek debutant Tsitsipas will face six-time champion Federer while Zverev will face Austrian Dominic Thiem.