Hannah Green had both momentum and luck by her side as she was ahead of the Women's P.G.A. Championship to three shots on Friday.
Green, a 22-year-old Australian, kept her momentum from a beautiful opening round in which she only needed 23 putts. On Friday, she had 27 putts en route to a three-under-par 69 and a seven-under total of 137.
Ariya Jutanugarn, the two-time big winner from Thailand, was the only one after the second 70 shots at the Hazeltine National Golf Club in Chaska, Minn.
Lydia Ko from New Zealand, who shot 70, and the defending champion, Park Sung-hyun, who shot 71, were climbed 141 for third place.
Nelly Korda is at 142 with Angel Yin, while Lizette Salas, Moriya Jutanugarn, Lin Xiyu, Kang Ji-min, Caroline Hedwall, Nuria Iturrioz, Kim Hyo-joo, Pernilla Lindberg and Lexi Thompson are at 143.
Green also brought a shot for the second consecutive day. Groen put her second shot on the par-4 12th in the water. After a penalty, her ball finally ran into problems. But she threw it out with a wedge, and it rolled straight in for a par save.
"When it went, I just laughed," she said. "I think with the hole-out at seven yesterday and the hole-out today, it's really going my way."
Green started her round with a bogey on the first hole – the lonely spot on her score card – but birdied nrs. 2, 6, 8 and 14. 
The American Michelle Wie, who returned to the game for the first time in two months, stumbled to the finish for the second street day with a shocking 10-over 82.
Who, who of the wrist surgery comes off, had one of the worst performances of her career, finishing in 147th place with a score of 22 over 166.
"Not great," Who said when asked how her hand felt. "In an ideal world I would wake up and make amends and play next week. Go back and find out what the future offers."