Who had a higher singles ranking, Paul Haarhuis or Katarina Srebotnik?
Paul Haarhuis: Paul Vincent Nicholas Haarhuis (born 19 February 1966) is a Dutch former professional tennis player. Paul Haarhuis:  He is a former World No. 1 doubles player and reached a career-high singles ranking of World No. 18 in November 1995. 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.
Paul Vincent Nicholas Haarhuis