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Cassandra "Cassie" JackmanMBE (born 22 December 1972 and competing in some years as Cassie Campion) is an English former squash player who won the World Open in 1999. She was England's leading player throughout much of the 1990s and the first few years of the 21st century. She retired due to a recurring back injury in December 2004.
She lost the 1996 World Open final to Sarah Fitz-Gerald 9–4, 9–2, 4–9, 9–6 who would go on to win another four World Opens. At the 1998 Commonwealth Games she won a gold medal in the doubles with Sue Wright, and a bronze in the singles.