‘We are all so proud of you’: Kate Middleton congratulates Emma Raducanu on US Open win

‘Huge congratulations,’ tweeted duchess

(Getty Images)

The Duchess of Cambridge has congratulated Emma Radunacu on her historic US Open win on Saturday.

The 18-year-old, who was the first qualifier ever to reach a Grand Slam final, became Britain’s first female singles Grand Slam champion for 44 years.

Radunacu beat the 19-year-old Canadian Leylah Fernandez 6-4, 6-3, making her the youngest Grand Slam singles champion since 17-year-old Maria Sharapova won Wimbledon in 2004.

She is also the first woman ever to win the title in only her second Grand Slam tournament.

Following her win, Kate, who is known to be an avid tennis fan having frequented Wimbledon several times over the years, tweeted her congratulations via the Kensington Royal Twitter account, signing off with her initial “C”.

“Huge congratulations @EmmaRaducanu on your stunning performances and historic Grand Slam victory!” she began before going on to congratulate Fernandez.

“Incredible –we are all so proud of you. @LeylahFernandez well done on your amazing achievements at this year’s #USOpen, it’s been a pleasure to watch. C.”

But Kate is not the only royal family member to offer her congratulations.

The Queen also sent the US Open champion a message of, hailing her “remarkable achievement”.

“I send my congratulations to you on your success in winning the United States Open Tennis Championships,” a message from HRH to the teenager read.

“It is a remarkable achievement at such a young age, and is testament to your hard work and dedication.

“I have no doubt your outstanding performance, and that of your opponent Leylah Fernandez, will inspire the next generation of tennis players.

“I send my warmest good wishes to you and your many supporters.”