He was acquired by the Sox from the Charros de Jalisco of the Mexican League in July 1972.

At the age of 20, he was the fifth-youngest player to appear in an American League game that season.

His four hits were against Clyde Wright, Rich Hand, Dick Bosman, and Bert Blyleven.

Hernández was traded back to Jalisco for pitcher Francisco Barrios on December 4, 1973.

He posted a .264 batting average with 148 home runs and 958 RBI in the Mexican League.