"Those are the things that we players know in the locker room it's not fair play, it's not how we treat each other. But, again, it's allowed, so..." The 22-time Grand Slam champion did admit that he had a very good relationship with Norrie, however stated it made him much more confused in regards to the world No 13's perspective.

"I got along with Cameron really well all these years that he's been on the tour. Practised with each other," he defined. "He's very nice guy off the court, so I don't understand this kind of attitude on the court, to be honest."

And Djokovic hit out as he stated he would not permit behaviour like Norrie's as he defined his response on the court docket.