The Women's Tennis Association can trace its origins back to Houston, Texas when the inaugural Virginia Slims event was won on 23 September, 1970. Billie Jean King was a major figure in the early days of the WTA.
The formation of the Virginia Slims Circuit can be ascribed in part to the changes that tennis was undergoing at the time, and the way in which prize monies were distributed. In the two years since the beginning of the open era, a large number of male players began playing professionally, and the tournaments that they competed in, often combined events, attracted increased investment. As a result of this, the International Lawn Tennis Association began dropping several women's competitions from the tournaments it presided over: in 1970, it sanctioned 15 tournaments, that had previously been combined events, as being for men only.
The WTA attributes a large part of its development to a meeting held the week before the 1973 Wimbledon Championships. The meeting, held at Gloucester Hotel in London, united all of women's professional tennis in one tour. King was the founder of this new institution. After this King, a mutiple Grand Slam champion, began to pursue other ventures, such as Women's Sports Foundation, a charitable organization that she founded in 1974 with her husband Larry King, and Jim Jorgensen. In 1975, the WTA increased its financial stature by signing a television broadcast contract with CBS, the first in the Association's history. Further financial developments ensued: in 1976, Colgate assumed sponsorship of the Tour from April to November, and in 1979, Avon replaced Virginia Slims as the sponsor of the winter circuit, and in its first year offered the largest prize fund for a single tournament, $100,000 for the WTA Tour Championships, in the Tour's history. The Colgate Series, renamed the Toyota Series in 1981, included tournaments from the across the world, whereas the Avon sponsored events took place solely in the US. The two circuits were merged in the 1983 season, when Virginia Slims returned to take full sponsorship rights of the Tour; every tournament under the administration of the WTA now became part of the Virginia Slims World Championships Series.
The Tour continued to expand during these years. By 1980, over 250 women were playing professionally, and the Tour consisted of 47 global events, offering a total of $7.2 m in prize money. These increased financial opportunities allowed for groundbreaking developments not only in tennis, but across women's sports: in 1971, King became the first female athlete to surpass $100,000 in earnings for a single season; Chris Evert became the first female athlete to win over $1,000,000 in career earnings in 1976; and Martina Navratilova became the first to win over $1,000,000 in a single season in 1982. Navratilova's single season earnings exceeded $2 m in 1984; in 1997, Martina Hingis became the first to earn over $3 m over the course of season; in 2003, Kim Clijsters surpassed $4 m for a season; and in the 2007 season, Justine Henin earned over $5 m, becoming the first woman in sports to do this. Henin retired in 2008, becoming the first incumbent World No. 1 in the WTA rankings to do so.
Ranking points are also available at certain International Tennis Federation (ITF) events below Tier IV (see next section) as well as the Olympics.
The organization releases a weekly ranking of the players's performance in the tour. Players' ranking points are counted how they fare on individual rounds of a tournament (round points). The following table gives the distribution of "round points" (note that these values were changed for the 2007 season):
| Description | W | F | SF | QF | R16 | R32 | R64 | R128 | QLFR | Q3 | Q2 | Q1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grand Slam (Singles) | 1000 | 700 | 450 | 250 | 140 | 90 | 60 | 2 | 31 | 25 | 15 | 2 |
| Grand Slam (Doubles) | 1000 | 700 | 450 | 250 | 140 | 90 | 2 | - | 24 | - | - | - |
| SE Champs (Singles) | 750 | 525 | 335 | 185 | 105 | - | - | - | - | - | - | - |
| SE Champs (Doubles) | 750 | 525 | 335 | 185 | - | - | - | - | - | - | - | - |
| Tier I $3,000,000 (Singles) | 500 | 350 | 225 | 125 | 70 | 45 | 30 | 1 | 20 | - | 10 | 1 |
| Tier I $3,000,000 (Doubles) | 500 | 350 | 225 | 125 | 70 | 1 | - | - | 15 | - | 10 | 1 |
| Tier I $2,000,000 (Singles) | 465 | 325 | 210 | 115 | 65 | 40 | 25 | 1 | 15 | - | 10 | 1 |
| Tier I $2,000,000 (Doubles) | 465 | 325 | 210 | 115 | 65 | 1 | - | - | - | - | - | - |
| Tier I $1,340,000 (56S) | 430 | 300 | 195 | 110 | 60 | 35 | 1 | - | 15 | - | 10 | 1 |
| Tier I $1,340,000 (28S/32D) | 430 | 300 | 195 | 110 | 60 | 1 | - | - | 20 | 15 | 10 | 1 |
| Tier I $1,340,000 (16D) | 430 | 300 | 195 | 110 | 1 | - | - | - | - | - | - | - |
| Olympics | 353 | 245 | 175/135 | 90 | 48 | 28 | - | - | - | - | - | 1 |
| Tier II $650,000 (28S) | 300 | 215 | 140 | 75 | 40 | 1 | - | - | 15 | 10 | 5 | 1 |
| Tier II $650,000 (16D) | 300 | 215 | 140 | 75 | 1 | - | - | - | - | - | - | - |
| Tier II $600,000 (56S) | 275 | 190 | 125 | 70 | 35 | 20 | 1 | - | 10 | - | 5 | 1 |
| Tier II $600,000 (28S) | 275 | 190 | 125 | 70 | 35 | 1 | - | - | 15 | 10 | 5 | 1 |
| Tier II $600,000 (16D) | 275 | 190 | 125 | 70 | 1 | - | - | - | - | - | - | - |
| Tier III $225,000 (32S) | 165 | 115 | 75 | 40 | 20 | 1 | - | - | 5 | - | 3 | 1 |
| Tier III $225,000 (16D) | 165 | 115 | 75 | 40 | 1 | - | - | - | - | - | - | - |
| Tier III $175,000 (56S) | 140 | 100 | 65 | 35 | 20 | 10 | 1 | - | 4 | - | 3 | 1 |
| Tier III $175,000 (30/32S, 32Q) | 140 | 100 | 65 | 35 | 20 | 1 | - | - | 8 | 4 | 3 | 1 |
| Tier III $175,000 (30/32S, 16Q) | 140 | 100 | 65 | 35 | 20 | 1 | - | - | 4 | - | 3 | 1 |
| Tier III $175,000 (16D) | 140 | 100 | 65 | 35 | 1 | - | - | - | - | - | - | - |
| Tier IV $145,000 (32S, 32Q) | 115 | 80 | 50 | 30 | 15 | 1 | - | - | 7 | 3 | 2 | 1 |
| Tier IV $145,000 (32S, 16Q) | 115 | 80 | 50 | 30 | 15 | 1 | - | - | 3 | - | 2 | 1 |
| Tier IV $145,000 (16S, 16D) | 115 | 80 | 50 | 30 | 1 | - | - | - | - | - | - | - |
| ITF $100,000 + H* (32) | 75 | 55 | 40 | 20 | 10 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $100,000 + H* (16) | 75 | 55 | 40 | 20 | 1 | - | - | - | - | - | - | - |
| ITF $100,000 (32) | 70 | 50 | 35 | 18 | 9 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $100,000 (16) | 70 | 50 | 35 | 18 | 1 | - | - | - | - | - | - | - |
| ITF $75,000 (32) + H* | 65 | 45 | 29 | 16 | 8 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $75,000 (16) + H* | 65 | 45 | 29 | 16 | 1 | - | - | - | - | - | - | - |
| ITF $75,000 (32) | 55 | 39 | 25 | 15 | 7 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $75,000 (16) | 55 | 39 | 25 | 15 | 1 | - | - | - | - | - | - | - |
| ITF $50,000 + H* (32) | 45 | 32 | 20 | 12 | 6 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $50,000 + H* (16) | 45 | 32 | 20 | 12 | 1 | - | - | - | - | - | - | - |
| ITF $50,000 (32) | 35 | 25 | 16 | 9 | 5 | 1 | - | - | 3 | 2 | 1 | - |
| ITF $50,000 (16) | 35 | 25 | 16 | 9 | 1 | - | - | - | - | - | - | - |
| ITF $25,000 (32) | 25 | 17 | 12 | 7 | 4 | 1 | - | - | 1 | - | - | - |
| ITF $25,000 (16) | 25 | 17 | 12 | 7 | 1 | - | - | - | - | - | - | - |
| ITF $10,000 (32) | 6 | 4 | 3 | 2 | 1 | - | - | - | - | - | - | - |
| ITF $10,000 (16) | 6 | 4 | 3 | 1 | 1 | - | - | - | - | - | - | - |
A player's point total is calculated on a weekly basis, counting only tournaments played within the last year. The top 17 tournaments of the past year count toward a player's point total, with the lowest of the player's scores being dropped from the total. The exceptions are the four grand slam tournaments and the mandatory Tier I tournament Miami Masters, which always count toward the player's point total, even if their score in the slam is lower than another score achieved in a non-slam tournament. All players who qualify by ranking for acceptance into the main draw of a Grand Slam or the mandatory Tier I tournament will be entered automatically. Any player who is accepted into one of these tournaments and subsequently withdraws will automatically receive zero points for the tournament and will have it count as one of their best 17 tournament results.
In 1996, the WTA started awarding players "quality points", which were calculated based on the rankings of players they defeated in tournaments. This would give more points to a player who beat a top ranked player than one who beat a lower ranked player. Quality points were discontinued after the 2005 season and are no longer used. The Sony Ericsson have asked for the top 30 ranked women each week below.
| WTA Rankings (6 October 2008) | ||||
|---|---|---|---|---|
| Rk | Name | Nation | Points | +/- |
| 1 | Jelena Jankovic | 4,230 | +1 | |
| 2 | Serena Williams | 4,017 | -1 | |
| 3 | Dinara Safina | 3,782 | ||
| 4 | Elena Dementieva | 3,470 | ||
| 5 | Ana Ivanovic | 3,288 | ||
| 6 | Maria Sharapova | 3,041 | ||
| 7 | Svetlana Kuznetsova | 2,920 | ||
| 8 | Venus Williams | 2,311 | ||
| 9 | Vera Zvonareva | 2,182 | ||
| 10 | Agnieszka Radwańska | 2,146 | ||
| 11 | Patty Schnyder | 1,797 | ||
| 12 | Anna Chakvetadze | 1,747 | ||
| 13 | Daniela Hantuchova | 1,611 | ||
| 14 | Nadia Petrova | 1,589 | +4 | |
| 15 | Marion Bartoli | 1,570 | -1 | |
| 16 | Caroline Wozniacki | 1,558 | ||
| 17 | Victoria Azarenka | 1,534 | ||
| 18 | Flavia Pennetta | 1,510 | -3 | |
| 19 | Alize Cornet | 1,423 | ||
| 20 | Dominika Cibulkova | 1,262 | ||
| Pos | Player | Titles |
|---|---|---|
| 1 | / Martina Navratilova | 167 |
| 2 | Chris Evert | 154 |
| 3 | Steffi Graf | 107 |
| 4 | Margaret Court | 92 |
| 5 | Evonne Goolagong Cawley | 68 |
| 6 | Billie Jean King | 67 |
| 7 | Lindsay Davenport* | 55 |
| 7 | Virginia Wade | 55 |
| 9 | / Monica Seles | 53 |
| 10 | Martina Hingis | 43 |
| 11 | Justine Henin | 41 |
| 12 | Venus Williams* | 37 |
| 13 | Kim Clijsters | 34 |
| 14 | Conchita Martinez | 33 |
| 15 | Serena Williams* | 32 |
| 16 | Tracy Austin | 30 |
| * = active player | ||
Since 1990 (8 +):
1. 12 - Martina Hingis (1997)
2. 10 - Steffi Graf (1990, 1993)
2. 10 - Monica Seles (1991, 1992)
2. 10 - Justine Henin (2007)
5. 09 - Monica Seles (1990)
5. 09 - Steffi Graf (1995)
5. 09 - Martina Hingis (2000)
5. 09 - Kim Clijsters (2003, 2005)
9. 08 - Steffi Graf (1992)
9. 08 - Aranxta Sanchez-Vicario (1994)
9. 08 - Serena Williams (2002)
9. 08 - Justine Henin (2003)
| Pos | Player | Wins |
|---|---|---|
| 1 | / Martina Navratilova | 1,442 |
| 2 | Chris Evert | 1,304 |
| 3 | Steffi Graf | 900 |
| 4 | Virginia Wade | 839 |
| 5 | Arantxa Sanchez Vicario | 759 |
| 6 | Lindsay Davenport* | 753 |
| 7 | Conchita Martínez | 711 |
| 8 | Evonne Goolagong Cawley | 704 |
| 9 | Billie Jean King | 695 |
| 10 | Gabriela Sabatini | 632 |
| 11 | Pam Shriver | 625 |
| 12 | Helena Sukova | 614 |
| 13 | Nathalie Tauziat | 606 |
| * = active player | ||
| Rank | Player | Wins | Losses | Ratio |
|---|---|---|---|---|
| 1. | Chris Evert | 1,304 | 144 | .901 |
| 2. | Steffi Graf | 900 | 115 | .887 |
| 3. | / Martina Navratilova | 1,442 | 219 | .868 |
| 4. | / Monica Seles | 595 | 122 | .830 |
| 5. | Serena Williams* | 398 | 84 | .826 |
| 6. | Justine Henin | 493 | 107 | .821 |
| 7. | Maria Sharapova* | 305 | 70 | .813 |
| 8. | Venus Williams* | 506 | 120 | .808 |
| 9. | Martina Hingis | 548 | 133 | .805 |
| 10. | Kim Clijsters | 427 | 104 | .804 |
| * = active player | ||||
Minimum of 25 tournaments played. The source for this table is the Women's Tennis Association (WTA) as of July 9, 2008. For reasons that the WTA does not explain, the list omits players such as Billie Jean King (.818 win ratio in 850 matches), Evonne Goolagong Cawley (.810 win ratio in 869 matches), and Margaret Court.
| Player | Australia | France | Wimbledon | United States | Overall | Total | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S | D | MD | S | D | MD | S | D | MD | S | D | MD | S | D | MD | ||||
| Margaret Court | 11 | 8 | 2 | 5 | 4 | 4 | 3 | 2 | 5 | 5 | 5 | 8 | 24 | 19 | 19 | 62 | ||
| Martina Navratilova | 3 | 8 | 1 | 2 | 7 | 2 | 9 | 7 | 4 | 4 | 9 | 3 | 18 | 31 | 10 | 59 | ||
| Billie Jean King | 1 | 0 | 1 | 1 | 1 | 2 | 6 | 10 | 4 | 4 | 5 | 4 | 12 | 16 | 11 | 39 | ||
| Margaret Osborne duPont | A | A | A | 2 | 3 | 0 | 1 | 5 | 1 | 3 | 13 | 9 | 6 | 21 | 10 | 37 | ||
| Louise Brough Clapp | 1 | 1 | 0 | 0 | 3 | 0 | 4 | 5 | 4 | 1 | 12 | 4 | 6 | 21 | 8 | 35 | ||
| Doris Hart | 1 | 1 | 2 | 2 | 5 | 3 | 1 | 4 | 5 | 2 | 4 | 5 | 6 | 14 | 15 | 35 | ||
[S=Singles; D=Doubles; MD= Mixed Doubles; A = never played in the event]
| Rank | Player | Prize Money (US$) |
|---|---|---|
| 1. | Lindsay Davenport* | 22,144,735 |
| 2. | Steffi Graf | 21,895,277 |
| 3. | Serena Williams* | 21,761,407 |
| 4. | / Martina Navratilova | 21,626,089 |
| 5. | Venus Williams* | 20,477,056 |
| 6. | Martina Hingis | 20,130,657 |
| 7. | Justine Henin | 19,461,375 |
| 8. | Arantxa Sanchez Vicario | 16,942,640 |
| 9. | / Monica Seles | 14,891,762 |
| 10. | Kim Clijsters | 14,764,296 |
| * = active player | ||
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