Novak Djokovic apologized and said his injury 'hurt' after tennis fans mercilessly booed him off the US Open court

6:17am PDT - September 2nd, 2019    djokovic - Business Insider

Novak Djokovic was booed off court after retiring from his US Open third round match against Stan Wawrinka. The Serb called time on his tournament early in the third set after losing the opening two 6-4, 7-5. "It is very frustrating. Of course it hurts that I…