21-year-old Jakob Ingebrigtsen has been in great shape ahead of the indoor WC in Belgrade.
A month ago, he broke the world record of 1,500 meters - the time was 3.30.36.
On Sunday, the Norwegian went for World Cup gold.
But he had to settle for silver.
Beaten in the riot
It was a tough battle with Ethiopian Samuel Tefera - reigning world champion - and there Ingebrigtsen fell.
He led the whole race, but was passed in the race and had to settle for silver in the time 3.32.80.
Tefera finished in 3.32.37 and had to celebrate another gold.