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Yi Siling wins first gold medal of Games
The 23-year-old world number one and gold medal favourite lived up to her billing by beating Poland's Sylwia Bogacka into second place.
Bogacka, 30, qualified in first place and was leading until the eighth shot, when a wayward effort condemned her to silver.
China's Yu Dan collected the bronze medal with Beijing 2008 gold medallist Katrina Emmons fourth.