#4 Steffi Graf
German tennis queen Steffi Graf who dominated women's tennis in the late 1980's and 1990's was the last member to enter the privileged century club before Federer did so this year.
With an aggregated win percentage of 88.67%, Steffi stands second among all athletes in terms of win percentage. The only athlete in tennis who can boast of a 'Golden Slam' which she won in 1988, Steffi was a teenage sensation who charmed the tennis audience with her aggressive style of play and speed around the court.
One of the greatest exponents of the one-handed backhand, Graf was recently voted the 'greatest female tennis player of all-time' by Tennis.com in a survey. In a career spanning 17 years, Graf won 107 Singles titles including 22 Grand Slam titles.