US OPEN champion Emma Raducanu had a special Mandarin message for her fans in China. The British superstar, 18, blew away all the competition to become the first qualifier in history to win a Grand Slam. Emma Raducanu had a special message for her fans in China, thanking them for their support in Mandarin[/caption] Raducanu, from Bromley, won all ten matches without dropping a single set and completing the incredible sporting triumph on Saturday night. She beat fellow teenager Leylah Fernandez in the final 6-4 6-3, cementing her status as the new darling of British sport. And amid the media…