Tennis-Tsitsipas beats Thiem to claim ATP Finals title

LONDON, Nov 17 (Reuters) - Greek youngster Stefanos Tsitsipas claimed the ATP Finals title as he battled back to beat Austrian Dominic Thiem 6-7(6) 6-2 7-6(4) at the O2 Arena on Sunday.

The 21-year-old debutant became the youngest champion at the elite season-ending tournament since 2001. (Reporting by Martyn Herman; Editing by Ken Ferris)