Morgane Metraux of Switzerland entered the day trailing Celine Boutier by five strokes.
At the end of day two of the Olympic tournament, Metraux was up a stroke.
The 27-year-old Swiss golfer got off to a hot start, shooting an 8-under 28 on her front nine. She had two eagles on the front nine. On the LPGA tour, she has one eagle all season.
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A recap of her front nine:
Par-4 first: Birdie (-3)
Par-3 second...