U.S. Open semi-final results

Kelly Clark declined to compete in slopestyle Wednesday, giving offical victory of the TTR World Championship title to top slope qualifier Jamie Anderson. USO/Burton/Roose

No surprises Thursday from Stratton, Vt. at the Burton U.S. Open of Snowboarding, other than the weather which, with fog and sleet delaying the contest for over an hour, has been pretty atrocious. Kelly Clark advanced first -- nearly 10 points ahead of number two qualifier Hannah Teter -- in women's halfpipe semi-finals, continuing a dominating season-long streak going into finals.

The Men's semi-finals were stacked, per usual. Iouri Podladtchikov and last year's Open winner Kazu Kokubo qualified in first and second, with last week's Mammoth Grand Prix podium finishers Matt Ladley and Louie Vito in a two-way tie for the last qualifying spots. Full coverage of halfpipe semi-finals here.

Some upsets in slopestyle semi-finals Wednesday: Winter X slopestyle gold medalist Sebastien Toutant, TTR World Tour Champion Peetu Piiroinen, and current TTR World Tour number two Seppe Smits failed to make finals. Sage Kotsenburg never made it to the hill due to food poisoning, and Jenny Jones is out due to an injury in practice.

Slopestyle finals will go down Friday, with halfpipe finals Saturday. The Burton Global Open Series and TTR overall champs -- Peetu Piiroinen for a third year, and Jamie Anderson for a second -- will also be crowned Saturday. Watch highlights from the event on ESPN2 March 13 at 4:30 p.m. ET.

U.S. Open Men's Halfpipe semi-final results

U.S. Open Women's Halfpipe semi-final results

U.S. Open Men's Slopestyle semi-final results

U.S. Open Women's Slopestyle semi-final results