<Table> <Tr> <Th_colspan="2"> Men's Singles </Th> </Tr> <Tr> <Td_colspan="2"> 2018 Australian Open </Td> </Tr> <Tr> <Th> Champion </Th> <Td> Roger Federer </Td> </Tr> <Tr> <Th> Runner - up </Th> <Td> Marin Čilić </Td> </Tr> <Tr> <Th> Final score </Th> <Td> 6--2, 6--7, 6--3, 3--6, 6--1 </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> Draw </Th> <Td> 128 (16 Q / 8 WC) </Td> </Tr> <Tr> <Th> Seeds </Th> <Td> 32 </Td> </Tr> <Tr> <Th_colspan="2"> Events </Th> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Singles </Th> <Td> men </Td> <Td> women </Td> <Td> </Td> <Td> boys </Td> <Td> girls </Td> </Tr> <Tr> <Th> Doubles </Th> <Td> men </Td> <Td> women </Td> <Td> mixed </Td> <Td> boys </Td> <Td> girls </Td> </Tr> <Tr> <Th> Legends </Th> <Td> men </Td> <Td> women </Td> <Td> mixed </Td> </Tr> <Tr> <Th> WC Singles </Th> <Td> men </Td> <Td> women </Td> <Td> quad </Td> </Tr> <Tr> <Th> WC Doubles </Th> <Td> men </Td> <Td> women </Td> <Td> quad </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> ← 2017 </Td> <Td> Australian Open </Td> <Td> 2019 → </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Men's Singles </Th> </Tr>

Who won the men's singles at the australian open