R1 LEADERBOARD:
US unless stated
-6 S Prammanasudh, JY Lee (Kor), K Futcher, K Parker-Manzo
-5 K Tschetter, B Lincicome, N Gulbis, L Ochoa (Mex), K Webb (Aus), S-Y Kang (Kor), T Barrett, M Parmlid (Swe)
-4 A Rizzo, P Creamer, A Miyazato (Jap), M Pressel, SA Yim (Kor), B Kim (Kor) J Head (Eng), B Bader, E Blasberg
Money list rivals Karrie Webb and Lorena Ochoa were in a group one shot behind the leaders after 18 holes of the Wendy's Championship for Children.
Korean Jee Young Lee and Americans Katie Futcher, Kristal Parker-Manzo and Stacy Prammanasudh share the lead after carding six-under 66s in Dublin, Ohio.
But alongside Webb and Ochoa on five under were six others including Natalie Gulbis and Brittany Lincicome.
Paula Creamer and Morgan Pressel shot 68s, the same as England's Jo Head.
Karen Stupples, the 2004 British Women's Open champion, posted a 70, as did defending champion Cristie Kerr.
Welsh golfer Becky Morgan is a shot further back and Scotland's Mhairi McKay two shots back.