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.


Substitute Sesko seals win for Man Utd at Everton
Hetmyer runs rampage as West Indies crush Zimbabwe in T20 World Cup
Swiss star Wawrinka through to Dubai last 16
Arsenal restore five-point lead in title race, Liverpool leave it late
'Magical' Winter Olympics close with party in ancient Verona Arena
