‘In the heat of the moment you can say stuff you regret’: Andy Murray supports his fiancée Kim after she was caught on camera swearing at Australian Open semi-final... but rival WAG is not impressed

• Rant came as Ms Sears watched Murray's victory at Melbourne Park today
• 27-year-old appeared to mouth 'F*****g have that, you Czech flash f**k'
• It came as Murray secured a break in the first set against Tomas Berdych
• He beat Czech number 7, who is now coached by Murray's former trainer
• Murray defended Ms Sears, calling it 'completely normal' amid 'tension'
• Also backed coach Amelie Mauresmo, saying: 'Women can be very good coaches as well'

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Andy Murray has jumped to the defence of his fiancée Kim Sears after she appeared to launch a furious tirade at his opponent during his Australian Open semi-final victory.

In one of several heated moments during the clash, the usually poised 27-year-old appeared to hurl a string of expletives towards Czech player Tomas Berdych.

As tensions boiled over, the devoted supporter was caught on camera appearing to mouth 'F*****g have that, you Czech flash f***', or 'Take that, you flash f**k’. 

Kim Sears (pictured left and right) appeared to unleash the tirade as she watched Andy Murray do battle in the Australian Open semi-final

In the X-rated rant, the 27-year-old appeared to say 'F*****g have that, you Czech flash f**k' as the camera put her on the big screen

Ms Sears was also facing a tennis WAG-off against Tomas Berdych's tanned model partner Ester Satorova (pictured left and right), who looked less impressed as the match developed 

The clip, which was recorded after the camera zoomed in on Ms Sears, sent Twitter into meltdown, with hundreds both amused and shocked by the outburst from Murray's usually-demure other half.

But speaking after the game, Murray said the seemingly uncharacteristic episode was down to 'a lot of tension' whipped up before the match.

He told reporters: 'When there's a lot of tension surrounding something which you (the media) created, which you created, then it's completely normal.

'The whole first set, everyone was tight. My physical trainer, physio, I'm sure for Dani it was uncomfortable.

'Even Tomas, who very rarely says anything on the court, there was tension there for him, as well. Yeah, in the heat of the moment you can say stuff that you regret. And, yeah, that's it.' 

The dramatic outburst came as Murray won a tense baseline rally in the first set to claim a break back against world number 7.

Luckily, there were no microphones nearby to pick up her exact choice of colourful words - but it was evident Ms Sears was deeply invested in the match.

The highly-charged match was the first time Murray and Berdych had come head-to-head since the latter hired Murray's former trainer Dani Vallverdu.  

Is Kim Sears trash talking as Andy Murray beats Tomas Berdych?

Ms Sears was caught on camera using colourful language as Murray secured a break in the third set to put himself firmly in control of the match with Czech Tomas Berdych. He won the game in four sets

The pair met for the tenth time in today's march. Berdych is now coached by Murray's former coach Dani Vallverdu, which made for an extra tense occasion

Mr Vallverdu helped Murray win his two grand slam titles and an Olympic gold before they stopped working together in November.

The dynamic dominated the pre-match build-up, despite both players trying to quietly play down tensions between the two camps.

But there was no doubt that it added a fiery edge to the match, with Murray admitting afterwards that there had been acrimonious mood around Melbourne Park.

Murray eventually beat the Czech in four sets, earning himself a spot in the coveted final this weekend. 

Speaking on court, he said: 'A lot was made of Dani working with him. We've been friends since we were 15 and I felt like that was a bit unfair and unnecessary.

'This is sport, there is more to life and I thought it was unfair and created a bit of extra tension. 

Berdych had won six of the 10 matches between him and Murray (pictured during today's game) and beat Rafael Nadal for the first time in nine years in the last eight - but Murray kept up his impeccable form 

Murray, pictured during today's game, will now compete in the final at Melbourne Park for the fourth time 

It was the first time Murray had played Berdych (pictured) since he hired Murray's former coach, which no doubt added a fiery edge to the match 

'It was there definitely at the beginning but I think everyone calmed down after the start of the match.'

But the Scot also used his victory to heap praise on his coach, Amelie Mauresmo.

He said: 'A lot of people criticised me for working with her and I think so far this week we have showed women can be very good coaches as well. 

'Madison Keys, who reached the semi-finals here, is also coached by a woman in Lindsay Davenport and I see no reason why that can't keep moving forward so I am very thankful to Amelie for doing it.

'I would say it was a brave choice from her and hopefully I can repay her in a few days.'  

Meanwhile, on the sidelines, Ms Sears was facing a tennis WAG-off against Berdych's tanned model partner Ester Satorova for the second day running.

Much has been made of the rivalry between the two women, both of whom have recently got engaged to their tennis pros.  

Murray and Berdych both proposed to their respective girlfriends recently before presenting them with expensive diamond rings.