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.
India cruise past Afghanistan as Sharma blitz earns series lead
India claimed a dominant seven-wicket victory over Afghanistan in the first Twenty20 international in New Delhi on Sunday, taking a 1-0 lead in the three-match series after chasing down a victory target of 157 with 38 balls to spare.
Haaland strike gives Man City 1-0 win over Man United after Foden sent off
Erling Haaland scored in the second half to give 10-man Manchester City a 1-0 win over bitter rivals Manchester United at Old Trafford on Sunday, with the strike initially disallowed for offside before the decision was overturned following a VAR review.
Antonelli stretches lead as Madring's first F1 winner
Kimi Antonelli moved a mighty step closer to the Formula One title on Sunday after winning the first Spanish Grand Prix held at Madrid's new circuit with a slice of luck on the side.
Lamine Yamal double helps Barcelona beat Levante
Lamine Yamal scored twice as Barcelona continued their perfect start to the season with a hard-fought 4-2 LaLiga victory over Levante in Valencia on Sunday.
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