LAHTI, Finland — Up until the final 100 meters of Thursday’s race, it looked as if the 2017 Nordic World Championships sprint title belonged to Russia’s Sergey Ustiugov. In fact, Ustiugov had won the qualifier in a time of 3:11.72 minutes, a commanding 2.7 seconds over Norway’s Finn Hågen Krogh. The Russian reigning Tour de Ski champion placed second in his quarterfinal by a mere 0.19 seconds. He was second again in his semifinal in a three-way...