<Tr> <Td> Mississippi State </Td> <Td> </Td> <Td>--</Td> <Td> 6 </Td> <Td>--</Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td>--</Td> <Td> 6 </Td> <Td>--</Td> <Td> 0 </Td> </Tr> <Tr> <Td> Vanderbilt </Td> <Td> </Td> <Td>--</Td> <Td> 6 </Td> <Td>--</Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td>--</Td> <Td> 10 </Td> <Td>--</Td> <Td> 0 </Td> </Tr> <Tr> <Td_colspan="99"> <Ul> <Li> $--Conference champion </Li> <Li> Florida ineligible for SEC championship due to NCAA probation . </Li> </Ul> Rankings from AP Poll </Td> </Tr> <Ul> <Li> $--Conference champion </Li> <Li> Florida ineligible for SEC championship due to NCAA probation . </Li> </Ul>

Who was the last defending ap national champion to lose their season-opening game