ANDY MURRAY hit out to Australian Open fans seemingly booing him despite his marathon victory - and even Nick Kyrgios got fed up with the raucous Aussie crowd's 's***show'.
But it is thought the supporters were actually imitating Cristiano Ronaldo's 'siu' celebration in a bizarre twist.
Murray, 34, was physically and mentally drained after his four-hour five-set battle with Nikoloz Basilashvili.
He eventually beat the No21 seed 6-1 3-6 6-4 6-7 6-4 to secure his first win at the tournament since 2017.
So when he heard the boo-like noises during his on-court interview, Murray said: "Painful stuff there. Those guys."
But while social media exploded, blasting the classless rowdy fans, others responded by suggesting for some strange reason they were shouting 'siu' rather than booing.
The noise, heard throughout the match, was made famous by the Manchester United forward.
After scoring, he regularly jumps up, rotates in mid-air and lands shouting 'siu' as the Old Trafford crowd joins in.
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Either way, it did not go down well with confused fans watching on telly.
One said: "The people shouting that embarrassing 'Siuuuu' Ronaldo noise when Murray is doing his on-court interview should be banned for idiocy."
Another wrote: "They're doing that stupid Cristiano Ronaldo 'suuuiiii' thing. It's cringey, but it's not booing. Seems like we'll be hearing it a lot this tournament."
A third added: "Regardless what it is, Andy Murray thought it was boos, the commentary team thought it was boos so it might have well have been boos given the negative impact on Andy Murray."
And a final user simply commented: "Clearly Murray isn’t a United fan."
The noises were heard again even more when Aussie Kyrgios was in action next on the loud John Cain Arena.
Chief entertainer Kyrgios got annoyed by the persistent noises, slamming the fans for doing it on 'every point' and complained to the chair umpire - which only prompted the supporters to do it more.
He said: "I know I created this s***show. I don’t mind if it’s on my serve, but for him [Broady]..."
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One commentator said: "It's probably not just water some of the spectators are on."
And after wrapping up his win, Kyrgios played up to the Melbourne faithful by doing the Ronaldo celebration on court.
The 26-year-old said: "I don't know what I've done to this crowd. It was so much fun with you guys."