Stefanos Tsitsipas, who was the runner at this year's Dubai Duty Free Tennis Championship, has won the ATP Finals title.
He came from a set down to beat Dominic Thiem on Sunday night at the O2 Arena in London.
The 21-year-old from Greece took the match in a pulsating final-set tie-break.
Tsitsipas becomes the youngest winner of the season-ending ATP Finals in 18 years.


Brook's defiant ton in vain as New Zealand beat England
Bencic tames Noskova to win Tokyo title
We need to find answers to stop Liverpool slide, says Slot
Rohit and Kohli bid likely farewell to Australia as winners
