Premise: The 2012-13 Tour de Ski was the 7th edition of the Tour de Ski. The event began in Oberhof, Germany on December 29, 2012, and ended in Val di Fiemme, Italy on January 6, 2013. The women's cup was won by defending champion Justyna Kowalczyk (Poland) while the men's cup was won by Russian Alexander Legkov ahead of defending champion Dario Cologna of Switzerland.
Hypothesis: The 2012-13 Tour de Ski was the 15th edition of the Tour de Ski.