Are you serious, Kyrgios? Teen sensation beats his hero Roger Federer - but spoils the occasion with foul-mouthed tirade and brattish fight with the umpire

Australian youngster Nick Kyrgios has produced a stunning upset to knock his boyhood idol Roger Federer out of the Madrid Open, but not before showing exactly why he already has a reputation as a hot head. 

After a first-set meltdown - which included a smashed tennis racquet and language so explicit that commentators were forced to apologise - the young Aussie denied top seed Federer the chance of a fifth title at the claycourt Masters event.

The 20-year-old has already said his latest triumph surpasses his Wimbledon victory over Rafael Nadal last year, as the best win of his career.

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Rising Australian star Nick Kyrgios has produced a stunning upset to knock his boyhood idol, world No.2 Roger Federer, out of the Madrid Open

 'I think this is definitely the greatest win over my career so far,' Kyrgios, who saved three match points, said.

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'It doesn't really feel real at the moment.

'I didn't really feel as if I was playing out there - it almost felt like I was watching.

'It was similar to that match at Wimbledon when I played Rafa. It's a strange feeling. It hasn't happened many times in my career ... it's happened twice now. It's pretty exciting.'

To clinch the win, Kyrgios needed to overcome an expletive-laden first-set meltdown, in which he was given a code for unsportsmanlike conduct in the first set tiebreak, saying 'get him out of here' to chair umpire Mo Lahyani in reference to a line umpire following an incorrect call.

Commentators were then forced to apologise multiple times for Kyrgios' foul language, and the outburst, which also involved him smashing his racquet into the clay court, didn't help the volatile star as he fell apart to lose the tiebreak 7-2.

In response to a Kyrgios barb, Lahyani told the fired-up right-hander to 'stop complaining'.

However, he calmed himself before rallying from a break down in the second set to force another tiebreak - and this time it was Federer who began to feel the heat.

As Kyrgios reeled off a string of impressive winners and powerful serves to race to a 5-0 lead in the tiebreak, the normally unflappable Federer barked 'we need a clown for this circus' at a change of ends.

When asked if he had been intimidated coming up against his idol for the first time, Kyrgios replied: 'I know he's the greatest. 

'I knew before the match I had to play one of the greatest matches I've ever played.' 

First-set meltdown; Kyrgios was given a code for unsportsmanlike conduct in the first set tiebreak

Nick Kyrgios was full of emotions during his fiery three set victory against Roger Federer

'(But) I wasn't intimidated at all - I have a lot of respect for him.' 

Showing the same confidence and audacity which helped him prevail over Nadal last year, Kyrgios produced some unbelievable tennis in the third-set tiebreak, saving three match points before raising his arms in triumph on his sixth match point, when Federer sent a forehand cross-court wide. 

'He plays the big points well and he likes the big stage,' said Federer. 

World No. 2 Roger Federer was knocked out of the competition by young gun Kyrgios denying him any chance at a fifth title at the claycourt Masters event in Madrid, Spain

'He has nothing to lose and if he can string a few good shots together that will keep him in a match.'

There were no surprises, he said: 'I expected it to be difficult. I know Nick can play.'

Kyrgios will next face 16th seed John Isner for a shot at the quarter-finals.

Fellow Australians Bernard Tomic and Thanasi Kokkinaki were less fortunate, with Tomic knocked out of the first round by Italian Luca Vanni, and Kokkinakis out after facing the big-serving American Sam Querrey 6-4 6-7 (5/7) 6-3.