Oddly enough, Hilde Sperling is regarded as the second best player from Germany behind Steffi Graf, and has not yet been inducted into the International Tennis Hall of Fame.
Despite winning the French Championships three times, being a Wimbledon finalist twice, reaching the semifinals of the French Championships and Wimbledon an additional six times, and being ranked in the top 10 for ten consecutive years, Sperling has not yet been inducted into the International Tennis Hall of Fame.
Helen Jacobs (pictured below) often regarded her as the third best player she ever played against.
Yet, Sabatini, Austin and Shriver made it in.....
Oh, and just for fun, here's a pic of Alice Marble and Bobbie Riggs Dancing at the 1939 Wimbledon Ball after their wins:
For those that didn't know it, Alice Marble wrote a scathing letter to the editor of the US Lawn Tennis Association Magazine in 1950 when Althea wasn't allowed to enter tournaments. In the letter, Marble wrote that she was embarrassed by "the bigotry" exhibited by her fellow all-white members of the USLTA when they wouldn't allow Althea Gibson to play.
One week later, Gibson received an invitation to the following month's U.S. Open.