What position did Roy Halladay primarily play?

Larry Walker is best known for playing with which MLB team? What uniform number did Larry Walker wear with the Rockies? What position did Todd Helton primarily play? What uniform number did Todd Helton wear with the Rockies? Roy Halladay is best known for playing with which MLB team? What uniform number did Roy Halladay wear with the Blue Jays? What position did Vladimir Guerrero Jr. primarily play? Vladimir Guerrero Jr. is best known for playing with which MLB team?