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A series of birdies over the last nine have saved Lydia’s hopes of challenging her to the women’s British Open.
A serious start to the second round at Carnosti left the Tokyo Olympics bronze medalist in danger of losing the cut.
She made three boogies and a birdie on the front nine and then sat outside the kit on the two unders.
On one occasion, a 24-year-old girl was forced to play a creative bunker shot to save her knees.
But three birdies between holes 11 and 14 put him back on track.
Finished second in an under for a tournament, six shots at speed after carding an under 71.
She managed to avoid the cut with two shots.
Koo improved 10 places on the leaderboard to stay at 31st.