Gavi will be the youngest player since Pele to start in a World Cup knockout game when he takes to the field for Spain against Morocco.
Luis Enrique's team go head to head with Morocco at Education City in a last-16 tie on Tuesday.
Barcelona midfielder Gavi started all three of Spain's Group E matches and that trend continued as he was named in Luis Enrique's starting XI.
At the age of 18 years and 123 days, he will be the youngest player to feature from the start of a World Cup knockout match since Brazil great Pele (aged 17 years and 249 days) in the 1958 final.
Pele scored twice in that match as Brazil beat Sweden 5-2 to win the first of five world titles.