Greece's Stefanos Tsitsipas poses with the winner's trophy to after the men's singles final match on day eight of the ATP World Tour Finals tennis tournament at the O2 Arena in London on November 17, 2019. - Tsitsipas beat Austria's Dominic Thiem to win the match 6-7, 6-2, 7-6. (Photo by Glyn KIRK / AFP)
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