What position did Mark McGwire primarily play?

What uniform number did Dennis Eckersley wear with the Athletics? What position did Catfish Hunter primarily play? Catfish Hunter is best known for playing with which MLB team? What uniform number did Catfish Hunter wear with the Athletics? Which player was nicknamed "Big Mac"? What position did José Canseco primarily play? José Canseco is best known for playing with which MLB team? What uniform number did José Canseco wear with the Athletics?