World No. 12 Emma Raducanu said having fun and zero expectations was the key to her stunning US Open victory. Raducanu, 19, was 18 when she became a Grand Slam champion at the US Open. Raducanu won the US Open in the most impressive way possible as she became the first qualifier in tennis history to win a Grand Slam. At Flushing Meadows, Raducanu won a total of 10 matches to lift the US Open title. To make it all even more impressive, Raducanu didn’t drop a single set in those 10 matches played. …