Switzerland's Morgane Metraux leads World No.5 Ruoning Yin and two-time medallist Lydia Ko at the halfway stage of the women's Olympic golf tournament.
The leading trio will go out in the final group at 6.39am ET in Friday's third round, following out the penultimate grouping of Pia Babnik, Mariajo Uribe and Bianca Pagdanganan.
