South Korean world champion Kim Woo-jin set the first world record of the Rio Olympics with a score of 700 in the 72-arrow ranking round.
The 24-year-old's score exceeded the mark of 699 set by his countryman Im Dong-Hyun at London 2012.
Patrick Huston was the first Briton in competitive action at the Games,finishing 38th out of 64 archers.
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