The Jönköping swimmer was close already last year, but missed then by one second.
On Saturday, he swam the 3,000 meters in 28.42, which was 46 seconds under the Italian Diogo Villarino's record from 2018.
Despite drizzle and around 16 degrees plus. Victor Johansson swam the race for the first time in a wetsuit.
I had no idea about the time, I just wanted to go. It was tough at the end, but nice to finally get to do it, says Johansson who later in July swims the World Championship in Singapore.
The Jönköping swimmer was completely superior and almost three minutes ahead of the second Pijus Guvenius, Stockholm.
Also on the women's side, the victory went to a World Championship swimmer when Thilda Häll, Elfsborg, won in 33.21, just over five seconds ahead of Linnéa Lindberg, Karlstad.