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.


Ruthless Man City thump Newcastle to reach League Cup final
F1 legend Mika Häkkinen turns brand ambassador for Only Legends Drive UAE
Guardiola vows to speak up for victims of global conflicts
Arsenal beat Chelsea 1-0 to reach League Cup final
Top-10 finishers in LIV events to receive word ranking points
