Suzann Pettersen, who held the outright lead after the second round was completed Saturday morning, struggled to a 75 in Round 3 to fall back into a share of second place along with Mi Hyun Kim, Laura Diaz, Catriona Matthew and Marilyn Lovander at 6-under-par 210.
The bad weather that plagued Tartan Fields over the first two rounds moved out of Ohio on Saturday allowing plenty of golf to be played. While there are a few players who will have to return to the course Sunday morning to finish off their third rounds, Han will be able to comfortably await the start of the final round.
'It was a little bit wet, but pretty good,' Han said of the course.
Han started on the 10th tee and found trouble early after an errant tee shot at the 12th led to a bogey. She recovered in style at the very next hole, however, and drained a 70-foot putt for a birdie.
'It was pretty uphill, so I hit it pretty strong,' she said.
The 26-year-old continued to distance herself on the front nine and dropped a wedge inside 12 feet for a birdie at the par-5 fourth. Han was coasting along at even par over her next four holes until her second shot found the water at the par-5 ninth.
Han scrambled to a bogey and managed to walk off with a solid margin with one round to play.
Kim, who won this event in 2002, struggled out of the gate with a bogey at the 10th, her first. She countered with a birdie at the par-4 12th and added a birdie at the par-3 17th to make the turn at 6 under.
She began to close in on Han with a birdie at the par-5 fourth, but stumbled to a bogey at the par-3 eighth to complete a round of 71.
Diaz also played the back side first and collected a pair of birdies over her first nine holes. The 29-year-old went cold on her second nine, until back-to-back birdies starting at the eighth moved her into a tie for second.
Reilley Rankin stood alongside Han to start the third round, but struggled to a 75 to fall three shots off the pace. She was joined by 2001 champion Wendy Ward, Brandie Burton, Nancy Scranton and Marisa Baena in a tie for seventh place at 5-under-par 211.
Reigning U.S. Women's Open champion Meg Mallon followed at 4-under-par 212 along with Lorena Ochoa and Lorie Kane. Kim Williams stands at 4 under through 17.
Teenage sensation Michelle Wie got off to a good start with a birdie at the 11th, her second, but her round seemed to be derailed by a quadruple bogey at the par-3 17th.
Wie persisted, however, and ran off four birdies on the front nine, including each of her last three holes, for a round of 71. Wie was joined by Patricia Meunier-Lebouc, Kelli Kuehne and Kristi Albers at 3-under-par 213. Rosie Jones is also at minus-3 with one hole to play to complete her third round.