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.
Alcaraz sets up Medvedev Indian Wells semi-final, Sabalenka and Rybakina advance
World number one Carlos Alcaraz charged past Cameron Norrie 6-3 6-4 on Thursday to set up an Indian Wells semi-final against Daniil Medvedev after the Russian ended defending champion Jack Draper's run 6-1 7-5.
Europa League: Watkins earns Villa win at Lille, Bologna and Roma draw
Aston Villa came away from Lille with a 1-0 win thanks to Ollie Watkins' goal in the first leg of their Europa League last-16 tie on Thursday, while Bologna and AS Roma played out a 1-1 draw in the all-Italian clash.
Sabalenka and Zverev march into Indian Wells semi-finals
Aryna Sabalenka and Alexander Zverev kept their Indian Wells title bids alive on Thursday, dispatching their respective opponents to book semi-final berths at the desert hardcourt tournament.
Trump says it is not appropriate for Iran to be at World Cup
US President Donald Trump said on Thursday the Iranian men's national football team was welcome to participate in the 2026 World Cup but that he believed it was not appropriate that they be there "for their own life and safety."
Italy will win Six Nations soon, says wing Lynagh
Italy are no longer content with being Six Nations underdogs and reflecting on their landmark win over England last weekend, wing Louis Lynagh believes they can soon win the championship.
