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.
England dismiss Pakistan for 110 to seize control of Lord's test
England bowled Pakistan out for 110 to take a first-innings lead of 180 and seize control of the second test at Lord's on Friday.
Raphinha, Fermin score as Barcelona beat Athletic in home opener
Raphinha and Fermin Lopez scored as Barcelona beat Athletic Bilbao 2-0 at the Camp Nou on Thursday in their first home match of the LaLiga season.
Celtic and Rangers to play cup match behind closed doors after pitch invasion
'Old Firm' rivals Celtic and Rangers must play their next home Scottish Cup matches behind closed doors after clashes between the Glasgow clubs' fans following this year's quarter-final at Ibrox.
Chelsea and Fulham reach League Cup third round as Welbeck scores on debut
Chelsea has eased into the League Cup third round with a 2-0 victory over third-tier Luton Town on Thursday as Danny Welbeck marked his debut with a goal in Xabi Alonso's first competitive home match in charge.
PSG to meet Barca, Man City as Champions League draw throws up marquee ties
Champions League holders Paris St Germain will take on Barcelona and Manchester City in this season's league phase, while record 15-time champions Real Madrid will face Inter Milan and Arsenal after Thursday's draw in Monaco set up several mouth-watering clashes.
10:00pm - Midnight
The Virgin Radio Weekend with Scott Forshaw
Dai Dai
Shakira & Burna Boy
Espresso
Sabrina Carpenter
I Just Might
Bruno Mars