Ryan St. Onge of the United States edged Canada's Steve Omischl to win the men's aerials event at the World Freestyle Championships on Wednesday.

St. Onge received 254.66 points after two jumps at the Inawashiro course to beat aerials world cup leader Omischl, who had 252.07 points. Canada's Warren Shouldice took the bronze medal with 240.14 points.

"Given the warm weather and difficult conditions, I was pleased with my jumps," said St. Onge, who is coming off a world cup aerials win in Moscow last month.

In the women's event, two-time defending world champion Li Nina of China won by a comfortable margin over compatriot Xu Mengtao.

Li pulled ahead of Xu on her second jump for a total of 203.21 points. Xu finished with 197.04 points, while Australia's Jacqui Cooper was third with 194.32 points.

Australia's Lydia Lassila, the 2009 world cup champion, missed her landing on the first jump of qualifying and failed to reach the finals.

The championships continues on Thursday with men's and women's halfpipe. Moguls and dual moguls events will be held this weekend.

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