Full name
David Fernando Cuellar Contreras

Date of birth
October 26, 2001

Place of birth
Queretaro, Mexico

Debut
On July 1, 201, at the Querétaro Arena, he won a unanimous decision over Omar Martínez Hernández in four rounds.

won his title
On June 12, 2021, at the Benito Juárez Auditorium in Los Mochis, Sinaloa, he defeated Karim Arce by technical knockout and won the vacant junior bantamweight world title.