<Tr> <Th_colspan="2"> Women's Singles </Th> </Tr> <Tr> <Td_colspan="2"> 2017 Australian Open </Td> </Tr> <Tr> <Th> Champion </Th> <Td> Serena Williams </Td> </Tr> <Tr> <Th> Runner - up </Th> <Td> Venus Williams </Td> </Tr>

Who won the 2017 australian open women's single title
find me the text answering this question