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.
Germany earn comeback win over Switzerland as Dutch beat Norway
Germany forward Florian Wirtz scored two goals, including an 86th-minute winner, and set up two more as his team twice came from a goal down to beat hosts Switzerland 4-3 in a friendly on Friday as both sides continued their preparations for the World Cup.
Tiger Woods charged with DUI after rollover crash in Florida
Former world number one golfer Tiger Woods was arrested on a charge of driving under the influence after his Land Rover rolled over on a two-lane road near his Jupiter Island home in Florida on Friday afternoon, the Martin County Sheriff's Office said.
100 horses to compete in 30th Dubai World Cup
The 30th Dubai World Cup meeting at Meydan Racecourse on Saturday, March 28, will see 100 horses from leading international stables competing across nine races for total prize money of $30.5 million.
Russell edges Antonelli as Mercedes set early practice pace in Japan
Formula One championship leader George Russell has edged out teammate Kimi Antonelli in a Mercedes one-two at the top of the timesheets in Friday's opening practice session for the Japanese Grand Prix.
Sabalenka sails past Rybakina to set up Miami Open final against Gauff
Defending champion Aryna Sabalenka has eased past Elena Rybakina 6-4 6-3 on Thursday to book a Miami Open final against Coco Gauff as the world number one bids to become the fifth woman to complete the 'Sunshine Double' after her title win at Indian Wells.
