What position did Randy Johnson primarily play?

What uniform number did Edgar Martínez wear with the Mariners? What position did Félix Hernández primarily play? Félix Hernández is best known for playing with which MLB team? What uniform number did Félix Hernández wear with the Mariners? What position did Julio Rodríguez primarily play? Julio Rodríguez is best known for playing with which MLB team? What uniform number did Julio Rodríguez wear with the Mariners? Which player was nicknamed "J-Rod"?