Three-time champion Pak Se-ri tops the leaderboard at the LPGA Championship on three under after 36 holes.
The South Korean was two under after the first round in New York and picked up another stroke on Friday.
Pak was one over for the round at the turn having bogeyed the seventh alongside eight pars.
But she raised her game on the back nine, collecting birdies at the 11th, 16th and 17th, although a second bogey on the par-four 13th undid some of that good work.
There was a four-way tie for second, with Germany's Sandra Gal, South Korea's Park Inbee, American Paula Creamer and Japan's Mika Miyazato all two under par.
Six players are one shot further back, including Ji Eun-hee whose four-under 68 was the round of the day.Meanwhile, South Korea's Grace Park, a major winner in 2004, announced her retirement at the age of 33 after shooting a three-over round of 75.
Collated second round scores & totals in the LPGA Tour Wegmans LPGA Championship, Locust Hill Country Club, Pittsford, New York, United States of America
(USA unless stated, par 72):
141 Se Ri Pak (Kor) 70 71
142 Paula Creamer 70 72, Mika Miyazato (Jpn) 70 72, Inbee Park (Kor) 72 70, Sandra Gal (Ger) 71 71
143 So yeon Ryu (Kor) 73 70, Na Yeon Choi (Kor) 70 73, Sydnee Michaels 72 71, Eun Hee Ji (Kor) 75 68, Suzann Pettersen (Nor) 71 72, Mi Jung Hur (Kor) 74 69
144 Ai Miyazato (Jpn) 70 74, Sun Young Yoo (Kor) 72 72, Karin Sjodin (Swe) 75 69, Lizette Salas 74 70, Stacy Lewis 72 72, Jennifer Johnson 73 71, Jeong Jang (Kor) 70 74
145 Giulia Sergas (Ita) 69 76, Gerina Piller 74 71, Ryann O'toole 69 76, Maude-Aime Leblanc (Fra) 72 73, Karrie Webb (Aus) 74 71, Sophie Gustafson (Swe) 73 72, Shanshan Feng (Chn) 72 73
146 Jenny Shin 71 75, In Kyung Kim (Kor) 73 73, Lexi Thompson 74 72, Cristie Kerr 70 76, Mina Harigae 74 72
147 Beatriz Recari (Spa) 69 78, Catriona Matthew (Sco) 75 72, Jodi Ewart (Eng) 75 72, Sarah-jane Smith (Aus) 75 72, Brittany Lang 72 75, Hee Young Park (Kor) 77 70, Marcy Hart 72 75, Taylor Coutu 73 74
148 Hee-Won Han (Kor) 74 74, Candie Kung (Tai) 71 77, Kris Tamulis 74 74, Jessica Korda 74 74, Becky Morgan (Wal) 75 73, Alena Sharp (Can) 77 71, Christel Boeljon (Ned) 74 74, Amelia Lewis 73 75, Mo Martin 71 77
149 Ji-Young Oh (Kor) 77 72, Pornanong Phatlum (Tha) 75 74, Chella Choi (Kor) 75 74, Morgan Pressel 74 75, Brittany Lincicome 76 73
150 Mariajo Uribe (Col) 74 76, Jennifer Rosales (Phi) 73 77, Haeji Kang (Kor) 77 73, Pat Hurst 74 76, Karine Icher (Fra) 75 75, Grace Park (Kor) 75 75, Belen Mozo (Spa) 74 76, Meaghan Francella 76 74, Dewi Claire Schreefel 76 74, Alison Walshe 73 77, Nicole Castrale 76 74
151 Karen Stupples (Eng) 76 75, Il-hee Lee (Kor) 76 75, Katie Futcher 74 77, Leta Lindley 78 73, Stephanie Louden 73 78, Yani Tseng (Tai) 76 75, Anna Nordqvist (Swe) 74 77, Amy Hung (Tai) 76 75, Haru Nomura (Jpn) 74 77, Katherine Hull (Aus) 75 76
Missed the cut:
152 Wendy Doolan (Aus) 75 77, Meena Lee (Kor) 73 79, Stephanie Sherlock (Can) 77 75, Lorie Kane (Can) 71 81, Kristy McPherson 75 77, Jee Young Lee (Kor) 77 75, Angela Oh 74 78, Caroline Hedwall (Swe) 77 75, Angela Stanford 76 76, Danielle Kang 76 76, Christine Song 72 80
153 Na On Min (Jpn) 75 78, Azahara Munoz (Spa) 75 78, Christina Kim 76 77, Amy Yang (Kor) 76 77, Hee Kyung Seo (Kor) 76 77, Kathleen Ekey 77 76, Meredith Duncan 77 76, Rebecca Lee bentham (Can) 77 76, Seon Hwa Lee (Kor) 80 73, Natalie Gulbis 76 77, Momoko Ueda (Jpn) 74 79, Maria Hernandez (Spa) 79 74, Amanda Blumenherst 77 76
154 Cheyenne Woods 75 79, Stacy Prammanasudh 78 76, Tiffany Joh 75 79, Reilley Rankin 78 76, Dori Carter 73 81, Jacqui Concolino 78 76, Mindy Kim (Kor) 77 77, Victoria Tanco 77 77
155 Jennifer Song 76 79, Tanya Dergal 75 80, Irene Cho 75 80, Jimin Kang (Kor) 73 82, Moira Dunn 76 79, Julieta Granada (Par) 76 79
156 Sandra Changkija 74 82, Beth Bader 78 78, Karlin Beck 73 83, Heather Bowie Young 74 82, Ashli Bunch 76 80, Jane Rah 77 79, Michelle Wie 74 82, Lisa Ferrero (Mex) 78 78, Pernilla Lindberg (Swe) 76 80, Laura Davies (Eng) 79 77
157 Hannah Yun 76 81, Jane Park 80 77, Janice Moodie (Sco) 78 79
Jennifer Gleason 84 73
158 Cydney Clanton 78 80, Numa Gulyanamitta (Tha) 78 80, Paige Mackenzie 80 78, Diana D'Alessio 80 78, Wendy Ward 79 79, Jennie Lee 80 78
159 Vicky Hurst 79 80, Danah Bordner 79 80, Laura Diaz 84 75
160 Ayaka Kaneko 80 80, Veronica Felibert 77 83, Maria Hjorth (Swe) 81 79
161 Jin young Pak (Kor) 78 83, Stephanie Kono 85 76
163 Elisa Serramia (Spa) 83 80, Jessica Shepley (Can) 82 81, Lisa Grimes 79 84
164 Lori Atsedes 80 84
167 Anna Grzebien 83 84
168 Song-Hee Kim (Kor) 82 86
169 Jessica Carafiello 86 83
170 Julie Peluso 84 86
177 Alison Curdt 88 89
WD: 82 Karen Davies, 84 Minea Blomqvist (Fin)
