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.
Man City reach League Cup semis, late Newcastle goal downs Fulham
Manchester City has eased into the semi-finals of the League Cup with a 2-0 home win over Brentford on Wednesday, and will meet holders Newcastle United who needed an added-time Lewis Miley goal to beat Fulham 2-1 at St James' Park.
Mbappe edges closer to Ronaldo record as Real survive Copa del Rey test
Kylian Mbappe has moved tantalisingly close to Cristiano Ronaldo's calendar-year scoring record for Real Madrid with a brace as they earned a 3-2 victory at third-tier Talavera de la Reina on Wednesday to reach the Copa del Rey's last 16 after a pulsating encounter.
MI Emirates hold on to stun Dubai Capitals by seven runs
MI Emirates has stunned the Dubai Capitals with a seven-run victory at the Dubai International Stadium on Wednesday, defending a modest total of 137/8.
Games of the Future open in Abu Dhabi
The UAE has officially opened the Games of the Future Abu Dhabi 2025.
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