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.
McIlroy set for Dubai return at DP World Tour Championship in November
Seven-time Race to Dubai champion Rory McIlroy will tee it up at the DP World Tour Championship from November 12-15 at Jumeirah Golf Estates in Dubai, as he bids to draw level with Colin Montgomerie's record haul of eight Harry Vardon Trophies.
Kaur steps down as India women's team captain
World Cup-winning skipper Harmanpreet Kaur announced on Tuesday her decision to step down from her role as captain of the Indian women's team in all formats.
Gauff hits out at racist abuse after replayed point in Beijing sparks backlash
Coco Gauff said she had received an "insane" amount of racial abuse on social media after the two-times Grand Slam champion beat local teenager Sun Xinran at the China Open on Monday in a match where a replayed point sparked an online backlash.
France come from behind to thrash Belgium
France came from a goal down to beat Belgium 4-1 in their Nations League Group A1 meeting at the Stade de France on Monday, while Italy secured a 3-1 win over Turkey, their third consecutive match without a loss.
Medvedev disqualified from China Open semi after hitting ball into crowd
Russian Daniil Medvedev was disqualified from his China Open semi-final clash with Novak Djokovic after hitting a rebounding ball into the crowd, striking a spectator in the eye.
