Jack Gruber / USA Today Sports
Jamie Anderson on the hill at the second jump during a training session at Extreme Park. (Jack Gruber/USA TODAY Sports Photo) 
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When: Feb. 6, 9.
Best of the U.S.: Jamie Anderson and Ty Walker.
Best of the rest: Spencer O’Brien of Canada was the 2013 world champion in slopestyle, and Silje Norendal of Norway is a strong threat.
U.S. chances to medal: Anderson, a two-time X Games champ, finished second to Norendal last month in Aspen, Colo.
Little-known fact: The biggest jumps are at the bottom.
