WTA Tour

The WTA Tour (currently known as the Hologic WTA Tour) is a worldwide top-tier tennis tour for women organized by the Women's Tennis Association. The second-tier tour is the WTA 125K series, and third-tier is the ITF Women's World Tennis Tour. The men's equivalent is the ATP Tour.

Structure (2024-present)
In 2024, the WTA made all WTA 1000 events mandatory. The WTA Elite Trophy did not return:
 * Grand Slam tournaments (4)
 * Year-ending WTA Finals (1)
 * WTA 1000 tournaments: Ten events with prize money ranging from US$2 million to US$10 million.
 * WTA 500 tournaments: 17 events with prize money from US$700,000 to US$900,000.
 * WTA 250 tournaments: 23 events, with prize money at US$250,000.

Structure (2021–2023)
The WTA Tour underwent a slight change in the classification of tournaments in 2021, which were reorganized on with similar nomenclature to that used on ATP Tour:
 * Grand Slam tournaments (4)
 * Year-ending WTA Finals (1)
 * Penultimate event WTA Elite Trophy (1)
 * WTA 1000 tournaments (9):
 * Mandatory: Five combined tournaments with male professional players with prize money ranging from US$6.5 million to US$8.3 million. These tournaments are held in Indian Wells, Miami, Madrid, Rome and Beijing. The Beijing tournament was not held in 2021 and 2022 due to the Covid-19 Pandemic and returned in 2023.
 * Non-mandatory: Four events in Doha/Dubai, Montreal/Toronto, Cincinnati, and Wuhan with prize money ranging from US$2.3 million to US$2.7 million. From 2020 to 2023, the tournament in Wuhan was suspended due to Covid–19 Pandemic. In 2022 and 2023, a new WTA 1000 tournament was held in Guadalajara as a replacement for Wuhan. From 2021-2023, Doha and Dubai switched off, with one being a WTA 1000 event and the other being a WTA 500 event.
 * WTA 500 tournaments: 12 events with prize money from US$700,000 to US$900,000.
 * WTA 250 tournaments: 30 events, with prize money at US$250,000.

Structure (2009–2020)
The WTA Tour comprised from 2009 to the 2021 reorganization:
 * Grand Slam tournaments (4)
 * Year-ending WTA Tour Championships (1)
 * Penultimate event WTA Elite Trophy (From 2015 onwards) (1)
 * Premier tournaments (21):
 * Premier Mandatory: Four combined tournaments with male professional players, with US$6.5 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 $2.8 million events in Doha/Dubai, Rome, Montreal/Toronto, Cincinnati, and Wuhan.
 * Premier: 12 events with prize money from US$799,000 to US$2.5 million.
 * International tournaments: There were 32 tournaments, with prize money for all except four events at US$250,000. The exceptions are the Shenzhen Open, Moscow River Cup, Hong Kong Tennis Open, the Tianjin Open, and the year-ending WTA Tournament of Champions, each with prize money of US$750,000.

WTA rankings
WTA publishes weekly rankings of professional players.

Ranking method
The WTA rankings are based on a rolling 52-week, cumulative system. A player's ranking is determined by her results at a maximum of 18 tournaments for singles and 12 for doubles. Points are awarded based on how far a player advances in a tournament. The basis for calculating a player's ranking are those tournaments that yield the highest ranking points during the rolling 52-week period. The period must include:
 * the four Grand Slams
 * six WTA 1000 Mandatory combined/virtually combined tournaments
 * one WTA 1000 Mandatory (WTA-only) tournament
 * the best of seven results from all WTA 1000 Mandatory, WTA 500, WTA 250, and WTA 125 Tournaments and ITF W15+ events
 * the WTA Finals as a bonus tournament if the player attended

All WTA players also have a Universal Tennis Rating, based on head-to-head results.

The points distribution for tournaments in 2024 is shown below: