[1][2] In 2021, Huseynov won one of the bronze medals in the men's 60 kg event at the 2021 European Judo Championships held in Lisbon, Portugal.

Seeing the 9-year-old Karamat's interest in judo, his uncle (sister's brother) Olympic champion judoist Elnur Mammadli advised in 2007 to enroll the boy in this sport.

In 2014, he wins a gold medal at the European Youth Cup in the Portuguese city of Coimbra, and takes bronze at a similar tournament in Bielsko-Biala, Poland.

Karamat Huseynov won a silver medal at the 2015 European Youth Olympic Festival in Tbilisi.

In June 2021, at the World Championships, which took place in the capital of Hungary, in Budapest, an Azerbaijani athlete won a bronze medal in the up to 60 kg weight category, defeating Magzhan Shamshadin, an athlete from Kazakhstan, in a fight for 3rd place.