Pettersen, looking for her first victory of the year after winning five times last season, shot a 72 on the Bay Course of the Kapalua Resort and Lang fired a 71. That left them at 4-under 140.
Lorena Ochoa, a winner seven times this season while protecting her No. 1 world ranking, shot a 69 to jump into a share of 11th place at 143.
Sharp made seven birdies Friday as part of her 67. Three of the birdies came on par-3 holes.