Passage: Magdalena Georgieva Maleeva (Bulgarian: Магдалена Георгиева Малеева pronounced [magdaˈlɛnɐ maˈlɛɛvɐ]) (born 1 April 1975) is a Bulgarian former professional tennis player. She played on the WTA Tour competing in singles and doubles, from April 1989 to October 2005. Her best WTA singles ranking was world No. 4.

Question: What was Magdalena Georgieva ranking?
No. 4.