Miyazato, just back from earning a U.S. LPGA Tour card for next year, opened with a triple bogey on the par-4 first hole and had six bogeys, a double bogey and four birdies on her way to a 36-hole total of 16-over 158 at the par-71 Naha Golf Club.
Miyazato won six times on the Japan LPGA this year and is the first Japanese woman to play in a men's domestic professional event.
There was some good news for the Miyazato family. Ai's older brother, Kiyoshi, shot a 4-under 67 and is tied for the lead with Yasuharu Imano (64) and Kaname Yokoo (70) at 7-under 135.
First round co-leader Dinesh Chand of Fiji shot a 72 to fall into a tie for seventh at 5 under.
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