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.


Tanzid century stuns Australia, keeps Bangladesh on top in Darwin
India's Tata Steel offload top-flight club Jamshedpur for $1
Shelton wins back-to-back Canadian Opens with victory over Nakashima
Swiatek defeats Rybakina to claim Canadian Open title
Dubai Police reminds football fans of stadium rules ahead of new season
