Novak Djokovic celebrates after match point against Alexei Popyrin during their men's singles match in the second round of the Australian Open.
Mandatory Credit:	David Gray/AFP/Getty Images

Novak Djokovic celebrates after match point against Alexei Popyrin during their men's singles match in the second round of the Australian Open.
Mandatory Credit: David Gray/AFP/Getty Images

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‘Tell it to my face’: Novak Djokovic responds to heckling fan during Australian Open win over Alexei Popyrin

Novak Djokovic was tested on the court in a tough second-round Australian Open win over home favorite Alexei Popyrin, but the Serb was also riled by at least one member of the crowd.