[1][2] He stood 6 feet 1 inch (1.85 m) tall and weighed 195 pounds (88 kg).

Hernández' professional career on the North American mainland spanned 11 seasons (1954–1958; 1961–1964; 1966–1967) and 370 games in United States and Mexican league baseball.

His notable seasons included 1955, when he won 23 games and lost 15 while pitching in 55 games and 271 innings for the Hobbs Sports of the Class C Longhorn League, and the following year, 1956, when he won 18 and lost 4, compiling a stellar 2.86 earned run average, for the Charlotte Hornets of the Class A Sally League.

[3] That performance earned him a late-season call-up to the Senators, when he appeared in four games.

Hernández split the next season between Charlotte, the Double-A Chattanooga Lookouts, and the Senators, for whom he worked in 14 more games.