Wimbledon 2015: Billie Jean King’s clarion call for equality rings louder than ever

They're either proud suffragettes or insufferable prima donnas, these female tennis players. The views are becoming increasingly entrenched. On one hand, they are castigated for barely grazing the courts with their paltry three setters, deafening their audiences with operatic screeching and then having the temerity to pocket equal prize money while complaining they're not on the show courts enough. Both the men's and women’s Wimbledon champions will take home £1.9m this year, after the rule of equality was established at The Championships in 2007.