[3] His mother, Lorena Camacho, was born in Mexicali, Mexico and raised in Fresno, Ca., while his father, Tony Castro, is a Salvadoran refugee from San Miguel.

[3] Castro graduated as valedictorian of Sunnyside High School in 2017 and went on to attend Fresno State University.

[4] Castro had his eyes set on the 2020 Olympics; however a last-minute illness forced him to pull out of the Team USA qualifiers.

He considered participating for his parents' home nations of Mexico or El Salvador before ultimately deciding to sign with Matchroom Boxing and become professional.

The bout was placed on the main card of Canelo Álvarez vs. Callum Smith at the Alamodome in San Antonio, Texas.