It became a final 13th place and it lacked just over 1.5 seconds to a place among the eight final swimmers.
The time 2.10,85 was 18 hundredths above his season best and as much as 3.19 seconds above his own Swedish record from 2021.
Last year's European Champion and 2022's World Championship silver medalist has had a slow swimming year.
But the Kungsbacka swimmer, who changed Bergen to Oslo together with the long-time coach Karl-Erik Gårdström, is aiming for the Olympic Games in Los Angeles 2028, in that case his fourth Olympic Games.
And for the old times.
I do not see why it should not be possible.
He improved the time from the heats by almost half a second.
We made some changes from the heat, it paid off a bit tactically, it went a bit faster. But not fast enough for a final swim and not as fast as I wanted to swim, he says.
Beside the record holder Victor Johansson, fourth on 400 meters freestyle and fifth on 800 meters freestyle, it has not gone very well for the Swedes in Singapore so far.
Erik Persson was the second Swede who managed to get past the heats. But in the semifinal it stopped.