Singh birdied the final hole to tie overnight leader Tetsuya Haraguchi at 12-under 204.
Haraguchi finished with a 70 that included three birdies and a bogey on the par-72 Kochi Kuroshio Country Club.
Singh is playing in his sixth full year without a tournament victory on the Japanese tour.
On Friday, 17-year-old Michelle Wie missed the cut after an 80 left her at 17-over 161.
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