Speed Skating coverage includes the Olympic debut of mass start racing, which differs from the traditional paired format. On the men’s side, Team USA’s Joey Mantia is the reigning world champion. The women’s field includes South Korean Kim Bo-Reum, who draws on her Short Track experience, plus German legend Claudia Pechstein and Team USA’s Heather Bergsma. Five miles longer than a marathon, the Cross-Country men’s 50km is one of the most grueling Winter Olympic events. Norwegian challengers looks to take down 2017 world champion Alex Harvey of Canada.