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.
Red-hot Sinner overcomes Michelsen to reach Miami quarters
World number two Jannik Sinner fought back in the second set against American Alex Michelsen to seal a 7-5 7-6(4) victory and reach the Miami Open quarter-finals on Tuesday, extending his record run of consecutive sets won at ATP Masters 1000 events.
Liverpool’s Salah to leave Anfield at end of season
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New Zealand players willing to play World Cup opener against Iran outside US
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Russo on target as Arsenal earn 3-1 win over Chelsea in Women's Champions League
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