Zverev beats Nadal at ATP finals

Alexander Zverev has beaten Rafael Nadal in their opening round-robin match of the ATP Finals.

The loss dents Nadal's chances of ending the year as the number one ranked tennis player in the world.

He entered the season-finale in London with an abdominal injury.

Tuesday's match sees Roger Federer, who also lost his opening encounter, take on Italy's Matteo Berrettini.

Play gets underway at 6:00 pm UAE time.

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