Not only did Dario Cologna ski to a dominating win in Stage 7 of the Tour de Ski , but by trouncing his chief rival Petter Northug ( NOR ) , he all .
Not only did Dario Cologna guaranteed himself a victory in the overall race .
Not only did Dario Cologna ski to a dominating win in Stage 7 of the Tour de Ski , but by trouncing his chief rival Petter Northug ( NOR ) , he all but guaranteed himself a victory in the overall race .