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.
F1 calls off April races in Bahrain and Saudi Arabia
Formula One's Bahrain and Saudi Arabian Grands Prix will not take place in April due to the ongoing situation in the Middle East, the sport announced on Saturday.
Man City lose ground on Arsenal with draw at West Ham
Manchester City has lost further ground on Premier League Arsenal on Saturday as they were held to a 1-1 draw at West Ham United, which left them nine points behind the leaders with a game in hand.
Dowman makes history to seal vital Arsenal win over Everton
Arsenal teenager Max Dowman, aged 16 years and 73 days, has become the Premier League's youngest scorer as he sealed a vital 2-0 home victory over Everton to move his side provisionally 10 points clear in the Premier League title race on Saturday.
Antonelli takes record pole in China as Mercedes dominate
Italian teenager Kimi Antonelli became the youngest Formula One driver to take pole position for a full grand prix after qualifying fastest for Mercedes in China on Saturday.
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