He started the final by flying over 5.55.
Then the 21-year-old continued in the same way, throughout the competition.
When the American Christopher Nilsen then failed 6.02, the matter was clear, because Armand Duplantis, on the other hand, flew over the height in the first attempt.
- It's crazy.
It has been my dream since I was three years old.
Now I have won and it is completely sick, says a gold medalist, who pays tribute to both mother Helena and father Greg to the Olympic success:
- Without mom and dad, I am not here today, they mean so much.
It is my first Olympic gold and we have been dreaming about it for a very long time.
With gold in his Olympic debut, Armand Duplantis made an attempt at the record height of 6.19 - and he was really close.
In the first attempt, Duplantis was just a chest away from breaking his own record.
- It was very close, very close.
But I will not complain so much.
A world record is of course more perfect, but it is a perfect evening, says "Mondo" after the competition.
The article is updated!