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.
Romelu Lukaku makes Belgium's World Cup roster
Romelu Lukaku was named to Belgium's 26-man World Cup roster on Friday despite the team's all-time leading scorer being limited to only five appearances for Napoli this season due to injuries.
France reveals World Cup roster; Camavinga, Chevalier left off
France's World Cup roster includes a star-studded assortment of talent, with Real Madrid infielder Eduardo Camavinga arguably the most notable omission.
Punjab crack under pressure to leave IPL playoffs hopes in balance
Punjab Kings set the early pace in the Indian Premier League by going seven matches unbeaten, but a run of five straight defeats has left their playoffs hopes in the balance and assistant coach Brad Haddin concedes they have failed to deal with the pressure.
Mbappe booed on return as Real Madrid beat Oviedo 2-0
Kylian Mbappe was greeted with a chorus of boos and whistles from Real Madrid's own fans as he returned from a hamstring injury during his side's 2-0 LaLiga home win over Real Oviedo on Thursday.
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