He became the youngest finalist on his ATP Finals debut since Hall of Famer Jim Courier in 1991. "I'm proud of myself, how hard I fought today, how concentrated I stayed in the break points. JUST WATCHED Alexander Zverev: 'Amazing' to win ATP Finals Replay More Videos ... MUST WATCH Alexander Zverev: 'Amazing' to win ATP Finals 01:41Usually a lightning quick starter, Federer was instead rusty on Saturday. Stefanos Tsitsipas upset Roger Federer at the ATP Finals on Saturday. Thiem saved break points, tooThe Austrian shotmaker -- who overcame both Federer and Djokovic in the group stage -- saved all four break points he faced against Zverev.

Source: CNN November 16, 2019 17:09 UTC