TYSON FURY knocking out WWE star Austin Theory has been hailed as "f**king awesome" by fans.
The 34-year-old WBC world heavyweight champion was ringside at the Principality Stadium in Cardiff, Wales, for WWE's event Clash at the Castle.
Fury involved himself in the main event after Theory tried to cash in his Money in the Bank briefcase to have a shot at winning the WWE and universal championships off Roman Reigns, who was competing with Drew McIntyre.
Theory got too close to Fury just as the referee was about to accept the cash-in, and the 25-year-old ended up KO'd on the floor in one punch.
The crowd roared as Theory was left lifeless and Fury lapped up the reaction.
And Fury's latest WWE cameo has left fans all saying the same thing: "f**king awesome."
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One fan quote tweeted the WWE clip, and said: "Thank you, Fury."
Another said: "My favourite part of this evening without question."
Following the match, Fury hopped inside the ring and congratulated Reigns on his title defence.
Fury then helped McIntyre to his feet and sang American Pie alongside the Scot.
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Oasis' Don't Look Back in Anger also went down well with the crowd before Fury signed off thanking them for coming.
On Fury's singing, a fan tweeted: "To be honest most of WWE's Clash at the Castle was a bit of a big let down but Tyson Fury singing 'American Pie' after was legit the best thing on the show. lol."
Another said: "Drew comes up short in the world tonight match, but Tyson Fury singing 'American Pie' to him made everything better. What a life."
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