The current tournament structure was introduced in 2009. Premier Tournaments replaced the previous Tier I and Tier II events, and International Tournaments replaced Tier III and IV events.
1. Grand Slam tournaments (4)
2. Year-ending championships (WTA Tour Championships)
3. Premier tournaments:
a. Premier Mandatory: Four combined tournaments with male professional players, with U.S.$5.4 million in equal prize money for men and women (increased from $4.5 million in 2013). These tournaments are held in Indian Wells, Miami, Madrid, and Beijing.
Premier Five: Five $2 million events in Doha/Dubai, Rome, Montreal/Toronto, Cincinnati, and Wuhan.
b. Premier: Twelve events with prize money from U.S.$710,000 to U.S.$2 million.
4. International tournaments: There are 32 tournaments, with prize money for all except four events at U.S.$250,000. The exceptions are the Shenzhen Open, the Monterrey Open and the Korea Open, each with prize money of U.S.$500,000, and the year-ending Garanti Koza Tournament of Champions in Sofia, which has prize money of U.S.$750,000.
5. WTA 125k Series (since 2012): There are seven tournaments (two in China, one in Chinese Taipei, one in France, one in Thailand, one in Israel and one in United States), with prize money for every event at U.S.$125,000.