The 21-year-old debutant, the youngest of the eight qualifiers for the elite season-ender at the O2 Arena, displayed resilience and flair in equal measure to become the youngest champion since Lleyton Hewitt in 2001.
Twice French Open runner-up Thiem was not finished though and fought back to take the match into a tiebreak. After a sensational week in London, Tsitsipas looks poised to lead the charge for the young guns in 2020. He was also playing for the third successive day after losing a superb group match against Nadal on Friday and eclipsing six-time champion Federer in the semi-finals.
But he edged the tiebreak. Tsitsipas saved one set point with an athletic volley but then offered up another chance which Thiem took by landing a powerful first serve. The Austrian, whose run to the final will see him end the year ranked fourth in the world, then went for broke, throwing the kitchen sink at Tsitsipas as his groundstrokes rocked the Greek and he levelled the set at 3-3.
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