Who is the only tennis player to have won each of the four grand slam events at least four times?

Answer 1

Chris Evert and Martina Navratilova both won all four tournaments at least twice. But pride of place must go to Steffi Graf - she's the only person to win all four titles at least four times. Steffi's eventual haul of 22 titles included four Australian Opens, six French, seven Wimbledons and five US Opens.