Who did Dominic Thiem lose to in the 2019 ATP Finals?
Roger Federer
Novak Djokovic
Stefanos Tsitsipas
Rafael Nadal
Answer
In the 2019 ATP Finals, Dominic Thiem was the runner-up, losing to Stefanos Tsitsipas. Despite the loss, Thiem's performance in the tournament was highly praised.
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