Montalvo is a 17-year-old prodigy from Las Vegas, Nevada, with roots in Sinaloa, Mexico.
After compiling a 20-1 amateur record, he forwent the national circuit to gain pro-style experience sparring top fighters at the Top Rank Gym.
He turned pro in March 2024 and is coming off a unanimous decision win over Erick Eugenio Tovar Gutierrez in Colima, Mexico.