Nick Kyrgios now has the dubious distinction of being one of the worst characters in modern tennis. Multiple flare-ups with officials, heated exchanges with opponents (most notably, against Stansias Wawrinka) and several suspensions and fines! Hence, all of these have taken a course of normalcy with the Australian.
In the Wimbledon 2015, things fell apart when Nick Kyrgios had a fiery exchange with umpire Mohammed Layhani. Following a tough line call, Kyrgios threatened to stop playing until a tournament official was summoned for clarification. The Court mic found him saying the words ‘dirty scum’ at the umpire, which he later went on to deny.