LPGA player Mika Miyazato made five straight birdies on the back nine en route to a 5-under 67 and a five-shot lead after the second round of the Japan Women's Open on Friday.
Looking for her first professional career title, the 20-year-old Miyazato moved to 9-under 135 at Otone Country Club.
Miyazato, who shared the first-round lead with Ayako Uehara, had seven birdies, including five in a row from the 12th, against a pair of bogeys.
Chie Arimura shot her second consecutive 70 to sit alone in second in the third major tournament of the year.
South Korean Choi Na Yeon (69) and Uehara (73) were tied for third at 3 under.
World No. 1 and 2005 winner Ai Miyazato followed her opening 72 with a 70, moving up to a tie for fifth with Park Hee Young (66) and Miki Saiki (71) a shot further back.