Premise: Zaiga Jansone-Ivanova (born (1951--)24 1951 ) is a former Soviet Latvian tennis player and tennis coach. She was a five-time Soviet champion in women's doubles, 1973 Summer Universiade champion in women's doubles (all with Olga Morozova) and winner of the exhibition tennis event of 1968 Olympics in mixed doubles (with (Vladimir Korotkov).
Hypothesis: Zaiga Jansone-Ivanova and Olga Morozova won 5 soviet champiohships together in womens doubles