Nick Kyrgios labelled ‘an absolute knob’ with ‘maturity of 10-year-old’ for Australian Open antics by doubles opponent

Nick Kyrgios has been the talk of the Australian Open, but not everyone is happy with his antics.

The maverick Aussie has been entertaining and delighting his home crowd in both the singles and doubles.

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There has been plenty of trick shots, Cristiano Ronaldo celebrations and encouraging the crowd to make plenty of noise.

But not everyone is entirely happy with what he has been doing, particularly during his doubles quarter-final alongside Thanasi Kokkinakis.

One flashpoint saw him react furiously to a lost point, with the outspoken tennis star smashing a ball into the crowd at 120kph, striking a boy in the stomach.

His tears quickly turned to joy when Kyrgios gave his racket to the young fan, who was not seriously injured.

But Michael Venus, who lost to the two Australians alongside Tim Putz, laid into Kyrgios in an interview with a New Zealand broadcaster.

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He said “It's amazing, he can smash a ball out that hits a kid and just because he gives them a racket afterwards, people can say he's such a good guy.

"On the maturity side, you see why he's never fulfilled his potential and probably never will. His maturity level, it's probably being generous to [say it’s on a par with] a 10-year-old, it's at about that level.

"The amount of messages I got from people, an extreme amount, way, way more than I've ever had but then a lot of messages from people saying how embarrassed they were with the crowd's behaviour and they're sorry, it shouldn't have been like that.

"They'll always be his supporters and he'll spin it in a way that helps him but at the end of the day he's an absolute knob."

Kyrgios and Kokkinakis will face Horacio Zeballos and Marcel Granollers in their semi-final on the Rod Laver Arena on Thursday.