After the Tour de Ski’s previous dance with earth, wind and rain and the subsequent cancellation of the Stage 4 classic sprint followed by a Last year, Weng began the hill climb in second overall, 20 seconds behind Sweden’s Stina Nilsson. But more importantly in that 2017 race, Weng started 1:04 minutes ahead of Østberg in fourth. Nine k and 425 meters of climbing later, Weng took the win — she gained time on Østberg,...