The 21-year-old Miyazoto, ranked 23, and world number 34 Lee from Korea

The 21-year-old Miyazoto, ranked 23, and world number 34 Lee from Korea both shot rounds of five-under-par.

Michelle Wie, on a hot run of form with a victory and second-place finish in her last two tournaments, was hot on the heels of the leaders with a three-under-par round of 68 to take a share of fourth.

Ai Miyazoto, sat atop of the world rankings, had a disastrous first day, shooting a 76 to end the day tied for 51st and near the foot of a field of 60.