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Jang Ha-Na shook off a sore back to seize a one-shot lead in the first round of the US LPGA's Marathon Classic, firing six birdies in a five-under par 66.
The South Korean was one stroke in front of Australian Sarah Kemp, South African Lee-Anne Pace, Taiwan's Hsu Wei-Ling and American Nannette Hill.
But she almost didn't make it to the first tee.