Russia's Alexander Bolshunov, right, and Switzerland’s Jovian Hediger compete during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov, right, and Switzerland’s Jovian Hediger compete during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov competes during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov, left, and Switzerland’s Jovian Hediger compete during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's ‪Sergey Ustiugov, right, and Czech Republic’s Michal Novak compete during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's ‪ Sergey Ustiugov competes during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's ‪Alexander Terentev‬ competes during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov and Norway's Erik Valnes compete during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov competes during the men's cross country sprint classic quarter final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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From left, France's Richard Jouve, Norway’s Paal Golberg, Russia's Gleb Retivykh and Sergey Ustiugov compete during the men's cross country sprint classic semifinal race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Gleb Retivykh and Sergey Ustiugov compete during the men's cross country sprint classic semifinal race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Norway’s Paal Golberg and Russia's Gleb Retivykh compete during the men's cross country sprint classic semifinal race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov and Norway's Erik Valnes shake hands after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov and Norway’s Johannes Hoesflot Klaebo, placed first, shake hands after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov reacts after the men's cross country sprint classic final race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov competes during the men's cross country sprint qualification race at the 2021 FIS Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Sergey Ustiugov competes during the men's cross country sprint qualification race at the 2021 FIS Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov competes during the men's cross country sprint qualification race at the 2021 FIS Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Alexander Bolshunov competes during the men's cross country sprint qualification race at the 2021 FIS Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's ‪Alexander Terentev‬ competes during the men's cross country sprint qualification race at the 2021 FIS Nordic World Ski Championships, in Oberstdorf, Germany.

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Russia's Gleb Retivykh competes during the men's cross country sprint qualification race at the 2021 Nordic World Ski Championships, in Oberstdorf, Germany.

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