Who was the first major athlete in the Soviet Union to demand publicly to keep their tournament earnings was Natasha Zvereva or Katarina Srebotnik?
Natasha Zvereva: Natasha Zvereva, or Zverava, (born Natallya Maratawna Zverava; Belarusian: Наталля Маратаўна Зверава; 16 April 1971) is a former tennis player from Belarus. Natasha Zvereva:  Zvereva was the first major athlete in the Soviet Union to demand publicly that she should be able to keep her tournament earnings. Katarina Srebotnik:  She reached a career-high singles ranking of No. 20 on the Sony Ericsson WTA Tour on August 7, 2006, and a career-high doubles ranking of No. 1 on July 4, 2011.
Natasha Zvereva