America's Kaitlyn Farrington beat defending champion Torah Bright to win gold in the Winter Olympic ladies' halfpipe snowboarding competition.
Farrington, 23, scored 91.75 points to win by a margin of just 0.25 as 27-year-old Australian Bright had to settle for silver in Sochi.
American Kelly Clark, 30, champion in 2002 and a bronze medallist four years ago, finished third with 90.75.
Hannah Teter, who won in 2006, came fourth with a score of 90.50.
It meant America claimed three of the top four places a day after Shaun White finished fourth to miss out on a third successive gold in the men's halfpipe.
After the first of two runs, 27-year-old Teter led, with Farrington second, Bright eighth and Clark 10th.
Farrington failed to make the final directly from the heats, needing a second-chance semi-final to progress, but a stunning second run in the final saw her take gold in her first Winter Olympics.