He is the first heavyweight Iranian wrestler to reach the final in Olympic history.
Qasemi reached the final after outmuscling his US opponent 10-0 in a 33-second match, at the Carioca Arena 2 in Rio de Janeiro.
Before the final, he had overpowered wrestlers from Georgia, Canada, and Egypt.
Also on Saturday, Iran’s 86-kilogram freestyle wrestler Alireza Karimi was defeated against US wrestler J'den Cox 3-1 in the quarterfinal round and was eliminated from the games. Karimi had beaten Tunisia’s Mohamed Saadaoui and Bulgaria’s Mihail Ganev before the quarters.
The Iranian Rio Olympics squad finished the world's foremost sporting event with three golds, one silver, and four bronzes.