page_title: List of ATP number 1 ranked singles tennis players
section_title: Number 1 ranked players
hierarchical_section_title: List of ATP number 1 ranked singles tennis players / Number 1 ranked players
caption_attribution_description: English: Czechoslovak tennis player Ivan Lendl in the final of the 1984 ABN Tennis Tournament in Rotterdam.Nederlands: Original: Finale ABN Tennistoernooi Rotterdam; Lendl in actie
context_page_description: The ATP Rankings are the Association of Tennis Professionals' merit-based method for determining the rankings in men's tennis. The top-ranked player is the player who, over the previous 52 weeks, has garnered the most ranking points on the ATP Tour. Points are awarded based on how far a player advances in tournaments and the category of those tournaments. The ATP has used a computerized system for determining the rankings since August 23, 1973. Starting in 1979, an updated rankings list is released at the beginning of each week.
  Since 1973, 28 men have been ranked No. 1 by the ATP, of which 17 have been year-end No. 1. The current world number one is Novak Djokovic.
caption: Ivan Lendl spent a total of 270 weeks at the top of the ATP rankings.
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