Roger Federer (R) of Switzerland and Stefanos Tsitsipas of Greece pose after the singles final match between Roger Federer of Switzerland and Stefanos Tsitsipas of Greece at the ATP Dubai Duty Free Tennis Championships 2019 in Dubai, the United Arab Emirates, March 2, 2019. Roger Federer won 2-0 and claimed the title. (Xinhua/Mahmoud Khaled)