American debutant Joss Christensen wins freestyle skiing slopestyle gold . The 19-year-old from the United States won his first medal of the Games in a thrilling final run to win gold. Zhang Hong wins China 's first ever speed skating gold medal . German dominance in luge continues with relay gold .
American debutant Joss Christensen wins freestyle skiing slopestyle gold . Chinese skater Li Jianrou takes honors in women 's short-track 500m . Zhang Hong wins China 's first ever speed skating gold medal . German dominance in luge continues with relay gold .