LAKE PLACID—Kim Yu-na was not infallible. She still was a winner at Skate America.

Not stumbling at all were Tanith Belbin and Ben Agosto, who swept all three portions of ice dance.

Feeling nervous and “heavy,” Kim, 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, 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 over Flatt by more than 13 points overall.

Belbin and Agosto skated to “Ave Maria” and “Amen” and admitted it was not their very best. But their overall score of 195.85 was best by nearly 24 points over Italy’s Anna Cappellini and Luca Lanotte.

“Once again, we felt able to execute all three segments of the competition,” Agosto said of winning compulsories and original dance before taking the free dance.