She told the BBC: “It meant everything to get a message from Her Majesty.
“She’s such a great inspiration and role model for the whole country so to have a note from her…
“I was extremely honoured and very very grateful that she took notice of my tennis. I can’t believe it. I’m maybe going to frame that letter or something.”
The win is even more staggering considering the 18-year-old only finished her A-levels exams three months ago.
Even more spectacularly, Raducanu failed to drop a single set through her three rounds of qualifying and seven main-draw matches en-route to the final.
Following her straight set victory against fellow Canadian teenager Leylah Annie Fernandez, the Queen sent Emma a lovely note.
The message from Queen Elizabeth II read: “I send my congratulations to you on your success in winning the United States Open Tennis Championships.
“It is a remarkable achievement at such a young age, and is testament to your hard work and dedication.
READ MORE: Emma Raducanu vs Leylah Fernandez LIVE: US Open final updates
Other members of the Royal Family also sent their congratulations including the Duke & Duchess of Cambridge and The Prince of Wales & Duchess of Cornwall.
Kate Middleton and Prince William tweeted: “Huge congratulations to Emma Raducanu on your stunning performances and historic Grand Slam victory! Incredible – we are all so proud of you.
“Leylah Fernandez well done on your amazing achievements at this year’s US Open, it’s been a pleasure to watch. C”
Prince Charles and Camilla added: “Congratulations to Emma Raducanu on your US Open win – what a fantastic achievement! We are all so proud.
“Well done to Leylah Fernandez today too. An outstanding match between two inspiring young women – we can’t wait to see where you go next.”