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.
Kane double rescues England in comeback win over DR Congo
Harry Kane scored twice in the final 15 minutes to see England through to the World Cup round of 16 as they left it late overcome a dogged Democratic Republic of Congo 2-1 on Wednesday.
Gauff survives Wimbledon scare, Krejcikova rallies past Andreeva
Coco Gauff managed to shrug off her Wimbledon gremlins in the nick of time to avoid another early exit on Wednesday.
England-India T20 abandoned because of rain
England and India were left frustrated as the opening game of their three-match T20 series was abandoned because of rain at the halfway stage.
Sinner, Medvedev and Sabalenka reach Wimbledon round three
Defending Wimbledon champion Jannik Sinner had several members of Europe's Ryder Cup team watching his second-round clash with Nuno Borges on Wednesday and in golfing parlance he kept it straight down the middle in a relatively risk-free victory.
Osaka brings the style again to beat Gasanova in Wimbledon second round
Four-times Grand Slam champion Naomi Osaka continued her impressive start to her Wimbledon campaign with a clinical 6-3 6-2 victory over Russian qualifier Anastasia Gasanova to reach the third round on a sunny Wednesday.
