The results of the 2003 WTA Tour Championships held at the Staples Center in Los Angeles, United States. For the first time a round robin system was introduced, after the men's Tennis Masters Cup. Two groups of four players were formed and each contender had to play three matches. Also, for singles, instead of the top sixteen players qualifying, only top eight qualified for the WTA Tour Championships. For doubles, the top four pairs (previously top eight) pairs qualified for the WTA Tour Championships, but still continued with the single elimination format.