1977 WTA Tour
The 1977 WTA Tour consisted of a number of tennis tournaments for female tennis players. It was composed of the newly streamlined version of the Virginia Slims Circuit (which was now an 11-week tour of the US) and the Colgate Series. The year 1977 also saw the creation of the first official ranking system and these rankings were used to determine acceptance into the tournaments. Schedule. This is a calendar of all events which were part of either the Virginia Slims circuit or the Colgate International Series in the year 1977, with player progression documented from  the quarterfinals stage. Also included are the Grand Slam tournaments, the 1977 Virginia Slims Championships, the 1977 Federation Cup and a number of events not affiliated with either tour. Rankings. Below are the 1977 WTA year-end rankings (December 31, 1977) in both singles and doubles competition: