<Tr> <Th> Average </Th> <Th> Name </Th> </Tr> <Tr> <Td> 0.451 </Td> <Td> Barry Bonds </Td> </Tr> <Tr> <Td> 0.430 </Td> <Td> Mark McGwire </Td> </Tr> <Tr> <Td> 0.390 </Td> <Td> Babe Ruth (1) </Td> </Tr>

Who hold the record for most home runs in a single season