Nana Takagi wins gold as speed skating mass start event makes Winter Olympics debut

Nana Takagi of Japan celebrates victory after ladies' mass start event of speed skating at the 2018 PyeongChang Winter Olympic Games at Gangneung Oval, PyeongChang, Feb. 24, 2018. Nana Takagi claimed gold medal with 60 points. (Xinhua/Han Yan)