Asanka Brendon Ratnayake/AP
Novak Djokovic argues with the chair umpire during his second round match against Enzo Couacaud.
CNN
—
Novak Djokovic has become accustomed to enduring heckling spectators when he plays tennis. Alongside Nick Kyrgios, he is public enemy No. 1 among a number of fans.
And on Thursday, during the fourth set of his second-round match against Enzo Couacaud at the Australian Open, the situation boiled over as he complained to the chair umpire about the provocation he was…