Emma Raducanu's astonishing U.S. Open triumph could lead to a pot of gold worth around ₤20 million ($27.7 million) over the next two years and that may be just the start, according to sports marketing experts.

The 18-year-old Briton was almost unheard before reaching the fourth round at Wimbledon this year, having earned around $40,000 since her senior debut three years ago.

After becoming Britain's first female Grand Slam champion in 44 years and the new golden girl of women's tennis, Raducanu's earning potential is set to enter the stratosphere.