In this Friday, Feb. 17, 2017, photo, Nathan Chen of the United States competes in the men's short program at the ISU Four Continents Figure Skating Championships in Gangneung, South Korea. Chen won the men's title after Sunday's free skating. (AP Photo/Ahn Young-joon, File)
2013 world figure skating championships
The world's best skaters are in London, Ont., for the biggest event of the season.