Song was three shots behind leader Hilary Lunke after Saturday's third round, shooting a 3-under 68 for a 2-under 211 total. Annika Srenstam also was 2 under at Pumpkin Ridge.
Song birdied the par-5 18th hole and was showered with cheers from the gallery.
'I think it was a pretty solid round all around,' she said. 'My goal today was to stay patient, and I think I did that. I did not worry about what anyone else was doing.'
Song, 17, just finished high school in Bradenton, Fla., and will start her freshman year at Florida this fall.
Her twin sister, Naree, failed to make the cut at the Open.
The twins, who changed their last names from Wongluekiet to Song at the start of the season, were among 14 teenagers who qualified for the Open. Seven of them made the cut.
The biggest name among them was long-driving 13-year-old Michele Wie, who became the youngest player to win a USGA title for adults at the U.S. Women's Amateur Public Links two weeks ago.
Wie had a 9-over 222 going into Sunday's final round, well off the pace.
Wie left Saturday without speaking, embroiled in a controversy over incidents earlier in the week. Her father and caddie, B.J. Wie, claimed LPGA Tour pro Danielle Ammaccapane pushed his daughter during the first round then berated her in the scoring tent for a breach of etiquette.
B.J. Wie corrected his statements on Saturday, saying no physical contact was made.
Michelle, he said, was too emotional to talk with reporters. But he said he didn't think the controversy had anything to do with a 5-over 76 on Saturday.
'Actually I think her poor performance was because her swing was off,' he said.
Morgan Pressel, 15, also had a bad day with a 7-over 78 to for an overall 13-over 222. She double-bogeyed the fifth hole, then triple-bogeyed the sixth.
'I had two really bad holes, so that was basically my score,' said Pressel, who two years ago played in her first Open at 13.
The youngest player in this year's Open, 13-year-old Sydney Burlison, did not make the cut. She was born nine days after Wie.
LPGA Tour Veteran Dottie Pepper had to withdraw from the U.S. Women's Open after completing eight holes of Saturday's third round because of a left shoulder injury.
Pepper was 5 over for the day when she withdrew.
'I knew something wasn't right and was starting to get some tingling in my fingers, so that was enough,' she said. I couldn't hit the ball the way I do normally, so I made a good decision.'
Pepper, who had surgery on her shoulder last year, said the pain was in a different part of her shoulder than before, causing her concern. She expected to have an MRI on Monday when she visits her doctor in Georgia.
Pepper was forced to withdraw from the Open last year before the first round after she re-aggravated the shoulder. She had surgery on March 1, 2002.
THE HI/LO GAME
Annika Srenstam has gone conventional, at least with her putts.
The star from Sweden who became the first woman in 58 years to play in a PGA Tour event switched last week from keeping her left hand low while putting.
'Sometimes I have more feel with the right hand low,' she said. 'But sometimes I get nervous on short ones and therefore I do left-hand low to be more mechanical on short ones.
But once I got some breaking putts I found it very tough with the left hand low. And last week and this week I knew it was going to be big breaking putts and I needed some feel.'
Srenstam, who had 1-over 72s for the first two rounds, shot a 67 on Saturday, putting her on the leaderboard at 2 under.
Alison Nicholas, who won the U.S. Women's Open when it was played at Pumpkin Ridge before in 1997, was penalized two strokes on the seventh green Saturday for touching her putting line with a golf tee.
Nicholas was attempting to remove a spider.
The rules say players can't touch the line with anything but their hand or club.
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