Serbia's Novak Djokovic in action against Greece's Stefanos Tsitsipas during the Mubadala World Tennis Championship at Zayed Sports City in Abu Dhabi...
{"Image ImageDescription": "Serbia's Novak Djokovic in action against Greece's Stefanos Tsitsipas (unseen) during the Mubadala World Tennis Championship at Zayed Sports City in Abu Dhabi on December 20, 2019. (Photo by - / AFP) (Photo by -/AFP via Getty Images)"}