Ivan Ljubičić is a Croatian former professional tennis player. He reached a career-high Association of Tennis Professionals (ATP) world No. 3 singles ranking on 1 May 2006. His career highlights include reaching a major semifinal at the 2006 French Open, and a Masters title at the Indian Wells Masters in 2010. He also contested three other Masters finals, two in 2005 at Madrid and Paris, and the other at the 2006 Miami Open.

The PIF ATP Rankings are the merit-based method used by the Association of Tennis Professionals (ATP) for determining the qualification for entry as well as the seeding of players in all singles and doubles tournaments. The first rankings for singles were published on 23 August 1973 while the doubles players were ranked for the first time on 1 March 1976. Ranking points are awarded according to the stage of tournament reached, and the prestige of the tournament, with the four Grand Slam tournaments awarding the most points. The rankings are updated every Monday, and points are dropped 52 weeks after being awarded. Novak Djokovic is the current men's singles world No. 1.