I absolutely hate this "mandatory tournaments" rule. It boils down to slavery. And I'm sorry to say, saying this to black women is a provocation given US history. Having won the last 3 GS tournaments, the WS should have a say and basically tell the wta "Without us, you are nothing, and you know it". The WS started their career long ago. They always have chosen how to handle their career and it fits them that way.