

Starting in 1990, in conjunction with the expansion of ATP purview as the new men's tour operator, the ranking criteria were replaced with a 'best of' system modeled after competitive downhill skiing. The original ATP ranking criteria, which were then regularly published weekly only from mid-1979 and persisted through the 1980s, were based on averaging each player's results, though the details were revised a number of times. 1, Ilie Năstase, lamented that "everyone had a number hanging over them," fostering a more competitive and less collegial atmosphere among the players. While virtually all ATP members were in favor of objectifying event participation, the system's first No. The ATP's new ranking system was quickly adopted by men's tennis. Just two months later, in August, the ATP introduced its ranking system intended to objectify tournament entry criteria, which up to that point were controlled by national federations and tournament directors.

The ATP began as the men's trade union in 1972, through the combined efforts of Jack Kramer, Cliff Drysdale, and Donald Dell, and rose to prominence when 81 of its members boycotted the 1973 Wimbledon Championships.
