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Rumours of a potential deal began over the weekend after the 18-year-old from Bromley was seen wearing various pieces of the brand’s jewellery during her victorious US Open final.
The tennis champion stunned the world by winning the US Open on Saturday, beating Canadian Leylah Fernandez, 19, in straight sets.
She wore a set of £4,500 pearl and diamond earrings during the match, a white gold £3,275 ring and a £2,750 cross pendant. Ms Raducanu also wore a £17,100 diamond hinged bangle.
The star also wore jewellery by the brand when attending Monday night’s Met Gala alongside Jennifer Lopez, Billie Eilish and Kristen Stewart at the Metropolitan Museum of Art.
Ms Raducanu is also being linked with Chanel after she wore the French fashion house to the exclusive party.
Already the tennis player has a sponsorship deal with Nike and it is likely she will have received a bonus following her US Open win.
Watch: Emma Raducanu speaks of of becoming Grand Slam champion in 2014 interview
The details of her deals are likely to remain private. She is being managed by Max Eisenbud, vice-president at IMG sports management group, who was behind Maria Sharapova’s reported £200 million career.
Experts have predicted Ms Raducanu - who only sat her A-Levels this summer - could be Britain’s first billion-dollar sports star.
The PR guru Mark Borkowski, who has worked with Michael Jackson, Joan Rivers and Led Zeppelin said: “This is the start of something epic. She is a billion-dollar girl, no doubt about it.
“She is the real deal. It’s not just that she plays extraordinary tennis, it’s also her background, her ethnicity, her freedom of spirit. People also love the fact that she is vulnerable, but laughs the pressures away.”
The money-savvy teen - who achieved an A in A-Level economics this year - comes from a financial background. Both her Chinese mother and Romanian father work in finance.
And, according to The Times, she registered Harbour 6 Limited - which is said to be the vehicle to manage her finances - when she was just 17.
On Tuesday, Raducanu ticked off another of her bucket list visits during her stay in New York.
Raducanu - who made history by becoming the first qualifier to win the US Open on Saturday - was pictured talking to trading floor staff during her tour of the New York Stock Exchange.
Watch: Emma Raducanu says US Open win 'was best time of my life'