In 2018, Grigalashvili won one of the bronze medals in the men's 81 kg event at the Judo Grand Prix Antalya held in Antalya, Turkey.
The following year, Grigalashvili won one of the bronze medals in this event at the 2019 Judo Grand Prix Tbilisi held in Tbilisi, Georgia. In the same year, he won one of the bronze medals in the men's 81kg event at the 2019 Summer Universiade held in Naples, Italy.[3][4]