<Dt> Women's singles </Dt> <Table> <Tr> <Td> #</Td> <Td> Player </Td> <Td> Year </Td> <Td> Australian Open </Td> <Td> French Open </Td> <Td> Wimbledon </Td> <Td> US Open </Td> </Tr> <Tr> <Th> </Th> <Td> Helen Wills </Td> <Td> 1928 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> Helen Wills </Td> <Td> 1929 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> Margaret Court </Td> <Td> 1962 </Td> <Td> </Td> <Td> </Td> <Td> 2R </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> Margaret Court </Td> <Td> 1965 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Margaret Court </Td> <Td> 1969 </Td> <Td> </Td> <Td> </Td> <Td> SF </Td> <Td> </Td> </Tr> <Tr> <Th> 6 </Th> <Td> Billie Jean King </Td> <Td> 1972 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 7 </Th> <Td> Margaret Court </Td> <Td> 1973 </Td> <Td> </Td> <Td> </Td> <Td> SF </Td> <Td> </Td> </Tr> <Tr> <Th> 8 </Th> <Td> Martina Navratilova </Td> <Td> </Td> <Td> </Td> <Td> 4R </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 9 </Th> <Td> Martina Navratilova </Td> <Td> 1984 </Td> <Td> SF </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 10 </Th> <Td> Steffi Graf </Td> <Td> 1989 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 11 </Th> <Td> Monica Seles </Td> <Td> 1991 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 12 </Th> <Td> / Monica Seles </Td> <Td> 1992 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 13 </Th> <Td> Steffi Graf </Td> <Td> 1993 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 14 </Th> <Td> Steffi Graf </Td> <Td> 1995 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 15 </Th> <Td> Steffi Graf </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 16 </Th> <Td> Martina Hingis </Td> <Td> 1997 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 17 </Th> <Td> Serena Williams </Td> <Td> 2002 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 18 </Th> <Td> Serena Williams </Td> <Td> 2015 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> SF </Td> </Tr> </Table> <Tr> <Td> #</Td> <Td> Player </Td> <Td> Year </Td> <Td> Australian Open </Td> <Td> French Open </Td> <Td> Wimbledon </Td> <Td> US Open </Td> </Tr> <Tr> <Th> </Th> <Td> Helen Wills </Td> <Td> 1928 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr>

Who won 4 grand slams in one year