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.
Cameroon strike early to secure win over Gabon
Cameroon has put aside recent woes to open their Africa Cup of Nations campaign with a 1-0 victory over neighbours Gabon on Wednesday as Karl Etta Eyong’s early goal secured a much-needed win.
Dubai Capitals sail to playoffs after a six-wicket win over Sharjah Warriorz
Shayan Jahangir and Jordan Cox have registered fifties to help defending champions Dubai Capitals sail into the play-offs with a strong six-wicket win over Sharjah Warriorz at the Dubai International Stadium on Wednesday.
Stoppage-time comeback gives Burkina Faso victory in opener
Two goals deep in second-half stoppage time saw Burkina Faso snatch a 2-1 victory over 10-man Equatorial Guinea in the opening Group E match at the Africa Cup of Nations finals on Wednesday.
Archer out of Ashes, England drop Pope from Boxing Day test
A side strain ended England fast bowler Jofra Archer's Ashes campaign on Wednesday while the beleaguered tourists dropped batter Ollie Pope for the fourth test against Australia.
Martha Stewart joins Snoop Dogg as Swansea minority co-owner
American businesswoman and television personality Martha Stewart has joined Swansea City as a co-owner, the Welsh football club announced on Tuesday.
