The build-up was immense. Head to head skiing. A mass start classic race with 10-kilometers to prove world-class stamina with Québec City’s cross-country ski fans lining the course. In a world now rife with data and the application of that information enmeshed in sport, the calculus seemed simple enough. Norway’s Therese Johaug has made a clean sweep of every World Cup distance race she’s entered this season. Nine World Cup wins. Then add three distance...