It is the city's first-ever gold medal in the sport at the Asian Games.
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Hong Kong now has three gold medals and 25 medals overall, putting them 13th amongst competing countries.
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An impressive performance from equestrian athlete Jacqueline Siu in the individual dressage category won Hong Kong's first gold medal at the 2018 Asian Games.
The 35-year-old's win in individual dressage is also the city's first equestrian medal at an Asian Games.
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One silver medal and four bronze marked a strong opening for the city.