Mateusz Szczeciński is a Polish grappler and a jiu-jitsu black belt under Sylwester Dziekanowski of the Gorila Team, who specializes in no-gi BJJ, also called submission-wrestling. Szczeciński is one of the most celebrated grapplers of his generation due to his submission-hunting style and for having medaled at the ADCC Europe, Africa & Middle East Trials and won the Polaris Invitational title while also earning medals in the International Brazilian Jiu-Jitsu Federation (IBJJF) circuit.