Su Oh's brilliant form reversal continues apace on the LPGA Tour.
The Melburnian is tied-fifth in the Meijer Classic in Michigan at 10-under par through two rounds after 66-68.
She is just three shots from the lead held by South Korea's So Yeon Ryu.
Oh, 22, has been on a slow burn since she was the No. 1 amateur in the world and a member of Australia's world teams title winning team with Minjee Lee in 2014.
Earlier this season she had a dreadful run of missed cuts, but she changed her clubs, parted from her instructor Cameron McCormick, and opted to run her business alone, allowing her father SG Oh to return to Australia.
The changes have worked a treat. Oh has finished fourth, tied-17th in the US Open and fifth in her past three events, picking up $US 200,000 in prizemoney.