Which tennis player reached a higher World ranking in doubles, Slobodan Živojinović or Elena Vesnina?
Slobodan Živojinović:  Together with Nenad Zimonjić he is the only tennis player from Serbia to be the World No. 1 in doubles. Elena Vesnina: Elena Sergeyevna Vesnina (Russian: Еле́на Серге́евна Веснина́ ] ; born 1 August 1986) is a Russian professional tennis player. Elena Vesnina:  Her career-high rankings are world No. 13 in singles and World No. 3 in doubles.
Elena Sergeyevna Vesnina