Kate Middleton has shared her appreciation for British tennis star Emma Raducanu after she made history by winning her US open semi-finals in straight sets, securing her place in her first ever major final and a minimum prize of $1.25 million.The Duchess of Cambridge tweeted her congratulations to Emma after the amazing feat. She said: “What an incredible achievement at this year's #USOpen @EmmaRaducanu! We will all be rooting for you tomorrow.