What position did Sandy Koufax primarily play?

Which player was nicknamed "The Duke of Flatbush"? What position did Pee Wee Reese primarily play? Pee Wee Reese is best known for playing with which MLB team? What uniform number did Pee Wee Reese wear with the Dodgers? What uniform number did Sandy Koufax wear with the Dodgers? What position did Clayton Kershaw primarily play? What uniform number did Clayton Kershaw wear with the Dodgers? What position did Fernando Valenzuela primarily play?