Question: Who was the first major athlete in the Soviet Union to demand publicly to keep their tournament earnings was Natasha Zvereva or Katarina Srebotnik?
Sentence (from "Natasha Zvereva"): Natasha Zvereva, or Zverava, (born Natallya Maratawna Zverava; Belarusian: Наталля Маратаўна Зверава; 16 April 1971) is a former tennis player from Belarus.
Relevant evidence: Yes