LAKE PLACID, N.Y. — Kim Yu-na is not infallible. She's still a winner.

The world champion from South Korea won her second straight Skate America title despite losing the free skate Sunday to American Rachael Flatt.

Kim made two major mistakes, including a fall on the triple flip — the one element on which she has struggled at times. That left enough of an opening for Flatt, the U.S. runner-up last January, to take the free program 116.11 points to 111.70.

But Kim had such a large lead after her surpassing short program that she took the gold medal by more than 13 points.

"I missed one of my first elements, the flip," she said. "I learned a lot today — always try to focus on the next jump."

Flatt wasn't spectacular, either, and received no points for one of her spin sequences, when she almost seemed to lose her way on the ice. But she hit seven triple jumps and broke out in a huge smile after nailing a triple flip-triple toe loop on her second element.

Kim, meanwhile, landed only three triples cleanly.

"It's pretty exciting, I certainly skated like I train," Flatt said. "Personally, this was incredibly inspiring and a little exhausting at the end."

Flatt skated immediately before Kim, then watched the world champion struggle.

"She's a wonderful competitor and it's an honor to win the free skate," Flatt said. "It shows that everyone makes mistakes ... though we're all perfectionists."

Julia Sebestyen of Hungary finished third.

Later Sunday was the free dance.