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Kygrios jokes with the umpire, praises his opponent and mock's Rafael Nadal at the Australian Open

Tennis star Nick Kyrgios had all but hidden his bad boy antics in the opening of his second round match of the Australian Open, before lashing out at the end of third set in an extraordinary meltdown that threatened his hold on the match.  

The Australian 23rd seed dominated the first two sets against Frenchman Gilles Simon, with a jovial Kyrgios putting on a show for the Melbourne Arena crowd.

Kyrgios praised Simon's winners and even gave his opponent a point after an incorrect call from the chair umpire.

But when the Australian lost the third set, he unleashed on his coaches box - seemingly unhappy with their words of support.   

'Absolutely flying colours. So creative. So creative. Out of all the things you could say: ''Stay tough.'' Thanks, man. Thanks,' Kyrgios said.

Nick Kyrgios praises opponent Gilles Simon during his second round match at the Australian Open

'That's what I get on every break point. Wow. ''Stay tough,'' yep. That's good, that's good. S***. S***.'

Channel Nine commentator and tennis great John McEnroe feared the worst.

'This is all too familiar… meltdown,' he said.

'This had all the makings of a rout and now we're about to go to a fourth set. He must be a magician in his spare time, this guy, Simon.' 

Kyrgios took the first set in just 27 minutes, before speeding through the second and going up a service break in the third, earning deserved praise from commentators.

'This may be the best match he's played in here,' Jim Courier said.

At 4-2 up in the third, Courier left the commentary box to meet Kyrgios on court for his post match interview, thinking the match would be over soon.

But then the wheels fell off for Kyrgios, missing shots he had been cruising through in the first two sets, while Simon rallied to win four straight games to take the third set 6-4. 

Kyrgios was solid in the first two sets before a meltdown mid way through the third

Kyrgios unleashed on his coaches box - seemingly unhappy with their words of support

'Say something,' Kyrgios pleaded with his box. 'F*** me … F*** hell say something. Maybe something different.'

The Australian composed himself and took out the fourth 7-5 in an eventful second-round clash.

'I definitely lost my way a little bit,' Kyrgios admitted after the match. 

'He's a tough competitor. He knows how to win matches. I had to refocus. I could have gone to a dark place in the fourth set. I somehow pulled it away.'

Kyrgios will meet the winner of Mikael Ymer and Karen Khachanov in the third round, which could lead to a clash with number one seed Nadal in the fourth round.

Kyrgios breezed through the first set in just 27 minutes, with Channel 9 commentators thinking the match would be over quickly