The Women's World Golf Rankings, also known for sponsorship reasons as the Rolex Rankings, were introduced in February 2006. They are sanctioned by eight women's golf tours and the organisations behind them: Ladies Professional Golf Association (LPGA Tour), Ladies European Tour, Ladies Professional Golfers' Association of Japan (LPGA of Japan Tour), Korea Ladies Professional Golf Association (LPGA of Korea Tour), Australian Ladies Professional Golf (ALPG Tour), Symetra Tour, China Ladies Professional Golf Association Tour, the Ladies European Tour Access Series and also by the Ladies' Golf Union, which administers the Women's British Open and the United States Golf Association which conducts the U.S. Women's Open.
The idea of introducing a set of women's rankings similar to the Official World Golf Ranking was developed at the May 2004 World Congress of Women's Golf, and was first planned for 2005, but then put back to 2006.
The rankings are based on performances on the eight major tours (LPGA, JLPGA, KLPGA, LET, ALPG, Symetra Tour, LETAS, CLPGA) over a two-year period. Amateur players are eligible. The system for calculating the rankings is similar to that for the men's Official World Golf Ranking. Players receive points for each good finish on the relevant tours, with the number of points available in each event depending on the strength of the field, as determined by the competitors' existing rankings (when the rankings were introduced rankings were calculated for earlier periods; the first ever set showed notional changes since the previous week). The only exceptions are the five LPGA majors and all Symetra Tour, CLPGA and LETAS events, which have a fixed-point allocation. Rankings are tapered so the recent results are more important.
When the rankings were first introduced in February 2006, a player's ranking as calculated in the above description was divided by the number of events played, with a minimum required events of 15 over the previous two years. In addition, players were required to play in a minimum of 15 eligible events over the previous two-year period to be included in the rankings.
On 2 August 2006 the Rolex Rankings Board and Technical Committee announced following its bi-annual meeting two changes to the ranking formula.
Many commentators saw the latter change as directed at Michelle Wie, who at the time was ranked second in the world despite having competed in only 16 women's professional events in the two-year period. However, the chairman of the Rolex Rankings Technical Committee defended the change as one designed to make the women's rankings more comparable to the Official World Golf Ranking for men, which use a minimum divisor of 40 events.
On 16 April 2007, another modification in the formula was introduced. Instead of points being awarded on an accumulated 104-week rolling period, with the points awarded in the most recent 13-week period carrying a stronger value, points began to be reduced in 91 equal decrements following week 13 for the remaining 91 weeks of the two-year Rolex Ranking period rather than the seven equal 13 week decrements previously used. This modification did not have an immediate impact on the rankings.
When they were introduced the rankings attracted considerable criticism on two grounds. First, it was widely felt that members of the LPGA of Japan Tour were ranked too high, since few of them had competed successfully outside Japan. Second, the minimum of 15 events needed to qualify for a ranking was widely seen as having been selected purely to enable Michelle Wie to be highly ranked because she had played exactly that number in the preceding two years, while every other highly ranked player had played many more events. If the women's rankings used the same system used for the men's rankings - that is a minimum number of events of one but a minimum denominator of 40 to calculate the average points per tournament - Wie would have been just outside the top 10. But under the women's ranking system where only players who had played a minimum number of events were included, if the minimum number of events had been set higher than 15, Wie would not have been ranked at all.
The August 2006 revised formula addressed the second criticism. The technical committee that administers the rankings urged patience with regard to the first criticism, since the continuing "strength of the field" weighting of tournaments may correct the issue without any technical changes being made.
The rankings are used by each of the sponsoring tours to determine eligibility criteria for certain events. For example, 40 of the 144 places in the Women's British Open are currently awarded on the basis of the rankings--10 to LET members and 30 to LPGA members. Four of the 12 places in the European Solheim Cup team are allocated on the basis of the rankings.
Since 2013, the rankings at the end of each LPGA Tour season in odd-numbered years have determined the eight countries that will compete in the following year's International Crown, a LPGA-sponsored team event scheduled in even-numbered years and first held in 2014. More specifically, the countries whose top four players have the highest cumulative rankings are invited to compete. The individual participants from each qualified country are determined by the rankings immediately prior to the ANA Inspiration (known before 2015 as the Kraft Nabisco Championship) in the year of the event.
As of 19 February 2018
|2||Park Sung-hyun||South Korea||6.87|
|3||Ryu So-yeon||South Korea||6.66|
|4||Lexi Thompson||United States||6.65|
|6||Chun In-gee||South Korea||5.46|
|7||1||In-Kyung Kim||South Korea||5.41|
|9||Cristie Kerr||United States||4.97|
|10||1||Choi Hye-jin||South Korea||4.83|
Change column indicates change in rank from previous week.
|No.||Player||Country||Start date||End date||Weeks||Total weeks|
|1||Sörenstam, AnnikaAnnika Sörenstam||Sweden||21 February 2006||22 April 2007||60||60|
|2||Ochoa, LorenaLorena Ochoa||Mexico||23 April 2007||2 May 2010||158^||158^|
|3||Shin, JiyaiJiyai Shin||South Korea||3 May 2010||20 June 2010||7||7|
|4||Miyazato, AiAi Miyazato||Japan||21 June 2010||27 June 2010||1||1|
|5||Kerr, CristieCristie Kerr||United States||28 June 2010||18 July 2010||3||3|
|Miyazato, AiAi Miyazato (2)||Japan||19 July 2010||25 July 2010||1||2|
|Shin, JiyaiJiyai Shin (2)||South Korea||26 July 2010||15 August 2010||3||10|
|Kerr, CristieCristie Kerr (2)||United States||16 August 2010||22 August 2010||1||4|
|Miyazato, AiAi Miyazato (3)||Japan||23 August 2010||24 October 2010||9||11|
|Kerr, CristieCristie Kerr (3)||United States||25 October 2010||31 October 2010||1||5|
|Shin, JiyaiJiyai Shin (3)||South Korea||1 November 2010||13 February 2011||15||25|
|6||Tseng, YaniYani Tseng||Chinese Taipei||14 February 2011||17 March 2013||109||109|
|7||Lewis, StacyStacy Lewis||United States||18 March 2013||14 April 2013||4||4|
|8||Park, InbeeInbee Park||South Korea||15 April 2013||1 June 2014||59||59|
|Lewis, StacyStacy Lewis (2)||United States||2 June 2014||26 October 2014||21||25|
|Park, InbeeInbee Park (2)||South Korea||27 October 2014||1 February 2015||14||73|
|9||Ko, LydiaLydia Ko||New Zealand||2 February 2015||14 June 2015||19||19|
|Park, InbeeInbee Park (3)||South Korea||15 June 2015||25 October 2015||19||92|
|Ko, LydiaLydia Ko (2)||New Zealand||26 October 2015||11 June 2017||85||104|
|10||Jutanugarn, AriyaAriya Jutanugarn||Thailand||12 June 2017||25 June 2017||2||2|
|11||So-yeon, RyuRyu So-yeon||South Korea||26 June 2017||5 November 2017||19||19|
|12||Park Sung-hyun||South Korea||6 November 2017||12 November 2017||1||1|
|13||Feng, ShanshanShanshan Feng*||China||13 November 2017||Present||15||15|
|*||Current No. 1 player as of 19 February 2018|
|2008||Lorena Ochoa (2)||Mexico|
|2009||Lorena Ochoa (3)||Mexico|
|2010||Jiyai Shin||South Korea|
|2011||Yani Tseng||Chinese Taipei|
|2012||Yani Tseng (2)||Chinese Taipei|
|2013||Inbee Park||South Korea|
|2014||Inbee Park (2)||South Korea|
|2015||Lydia Ko||New Zealand|
|2016||Lydia Ko (2)||New Zealand|
|No. 1 all weeks of the year|
|2||South Korea||4||137||Jiyai Shin, Inbee Park, Ryu So-yeon, Park Sung-hyun|
|3||Chinese Taipei||1||109||Yani Tseng|
|4||New Zealand||1||104||Lydia Ko|
|6||United States||2||30||Cristie Kerr, Stacy Lewis|
As of 19 February 2018
Active players are in bold.
|Players||Date of first No. 1 position||First major title|
|Lorena Ochoa||23 April 2007||2007 Women's British Open|
|Ai Miyazato||21 June 2010||none|
|Lydia Ko||2 February 2015||2015 Evian Championship|
Annika Sörenstam of Sweden topped the first set of rankings, which was released on Tuesday 21 February 2006. Paula Creamer (United States); Michelle Wie (United States); Yuri Fudoh (Japan); and Cristie Kerr (United States) took the other places in the top 5. The top one hundred players in the initial rankings came from the following countries: