"How can we continue to play tennis if the women tournament's prize money is kept low," the letter said.
The letter was addressed to the president of the PTF, which was submitted by Pakistan women's number one player Ushna Sohail, Isha Jawad, Mansha Babar, Shamza Naz, Sara Mehboob, Mehak Khokhar, Sara Mansoor and Aleena Aftab.
The letter further said: "Tennis is world's most expensive sport. First of all we don't have a conducive environment to play tennis in the country, secondly no female player has a future in the sport."
It continued by stating the reason for an increase in women's prize money.
"The winning prize money for women's tournament should be increased so that female players can continue playing tennis."
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