<Tr> <Td> Mike Schmidt </Td> <Td> </Td> <Td> 1974--76 Philadelphia (NL) </Td> </Tr> <Tr> <Td> Ken Griffey, Jr . </Td> <Td> </Td> <Td> 1997--99 Seattle </Td> </Tr> <Tr> <Td> Alex Rodriguez </Td> <Td> </Td> <Td> 2001--03 Texas </Td> </Tr> <Table> <Tr> <Th> Player </Th> <Th> League, team and year </Th> </Tr> <Tr> <Td> Sam Crawford </Td> <Td> NL: Cincinnati Reds (1901), AL: Detroit Tigers (1908) </Td> </Tr> <Tr> <Td> Fred McGriff </Td> <Td> AL: Toronto Blue Jays (1989), NL: San Diego Padres (1992) </Td> </Tr> <Tr> <Td> Mark McGwire </Td> <Td> AL: Oakland Athletics (1987, 1996), NL: St. Louis Cardinals (1998--99) </Td> </Tr> </Table>

Who has the most leadoff home runs in a single season