Nelly Korda tied an Olympic record for a round with a 9-under-par 62 on Thursday to take a four-shot lead into the third round at Kasumigaseki Country Club in Kawagoe, Japan.
The 23-year-old American moved to 13-under with nine birdies, one eagle and a double bogey at the par-4 18th, matching the 62 carded by Russia's Maria Verchenova in the final round at the 2016 Rio Games.
Denmark's Nanna Koerstz Madsen (64 on Thursday) and Emily Kristine Pedersen (63) and India's Aditi Ashok (66) are tied for second at 9-under 133. Sweden's Madelene Sagstrom (68) is in solo fifth place at 8-under.
The competition is scheduled for 72 holes, but the International Golf Federation has alerted players of a tropical storm developing that could shorten the event to 54 holes.
--Field Level Media