Question: Who has achieved a higher World Ranking (in either singles or doubles), Goran Ivanišević or Nenad Zimonjić?
Sentence (from "Goran Ivanišević"): He coached Marin Čilić from September 2013 to July 2016, leading Čilić to his biggest achievement to date, the 2014 US Open title.
Relevant evidence: No