Probably the best of the 40s amazons was Pauline "Bobby" Betz. She had 5 grand slams-with 3 of those coming during World War 2. After the war she was the woman to beat, winning Wimbledon and the US in 1946 and mising a triple by a hair when Osbourne(duPunt) saved a match point in the French final. In 1947 the USTA suspended her and Sarah Palfrey for TALKING about turning pro. They played each other briefly, but Pauline was never again allowed to compete at Wimbledon or other amateur events.
In 1960 there was a little known women's pro tournament in Cleveland. This unique event was the only women's pro tennis tournament until the Open era. Pauline Betz barely lost the final to Althea Gibson 7-5 in the third.