He completed the three days of competition in 1:13:40.3 for a 47.1 second margin of victory over Canada's Alex Harvey in Falun.
The 21-year-old's triumph came just a day after winning his first ever World Cup as the 2017-18 Cross Country World Cup season came to an end.

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Speaking after the event, Bolshunov said: "After trying all season for a win and getting it yesterday I had a lot of confidence today and I felt strong.
"It's great to win like this at the end of the season. It leaves me with positive feelings heading into the training season."
Harvey, who started with bib 18 in the pursuit today, charged up the field to finish in second position after recording the fastest time of the day.

Alexander Bolshunov of Russia crosses the finish line as winner

Image credit: Reuters

Switzerland's Dario Cologna clinched the overall distance World Cup title - a record fourth distance title - by finishing in third position in the season-ender.
He previously shared the record with Norway's Martin Johnsrud Sundby, who finished in fourth place to end up second in the overall distance standings.

Bolshunov wins by huge margin in Men's 15km Pursuit

Cologna said: "I am satisfied with the podium. I had a very good end of the season. It is great to win the distance globe. Everything went perfect for me."
Meanwhile, Norway's Johannes Hoesflot Klaebo became the youngest ever winner of the men's overall classification at just 21.
His overall crystal globe adds to his already impressive collection of two sprint overall globes.
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