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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,^[1] but then put back to 2006.

Calculation of the rankings

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.

Original formula

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.

Formula revisions

On 2 August 2006 the Rolex Rankings Board and Technical Committee announced following its bi-annual meeting two changes to the ranking formula.^[2]

1. The elimination of the minimum event requirement. Players would no longer be required to participate in 15 qualifying events to be included in the rankings and could be included after playing in as few as one qualifying event. This change would also have the effect of permitting amateurs who had played well in one event to be ranked (e.g., Morgan Pressel, who finished second in the 2005 U.S. Women's Open, or Michelle Wie from age 13).


2. The introduction of a minimum divisor. Where previously a player's point total was divided by the number of events she played over the previous 104 weeks, now the player's point total would be divided by the greater of (i) the number of events played or (ii) 35. Thus, players with 35 or more events over the previous 104 weeks would continue to use the actual number of events played as the divisor, but players with fewer than 35 events would use 35 as the divisor.

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.^[3] This modification did not have an immediate impact on the rankings.

Criticisms

When they were introduced the rankings attracted considerable criticism on two grounds.^[4] 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.

Significance of the rankings

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.^[5] Four of the 12 places in the European Solheim Cup team are allocated on the basis of the rankings.^[6]

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.^[7] 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.^[8]

Current top ten

As of 12 November 2018

Rank	Change	Player	Country	Points
1		Ariya Jutanugarn	Thailand	7.99
2		Park Sung-hyun	South Korea	7.75
3		Ryu So-yeon	South Korea	6.85
4		Inbee Park	South Korea	6.71
5		Minjee Lee	Australia	5.90
6	1	Nasa Hataoka	Japan	5.51
7	1	Georgia Hall	England	5.48
8		Lexi Thompson	United States	5.24
9		Brooke Henderson	Canada	5.21
10		Ko Jin-young	South Korea	5.12

Change column indicates change in rank from previous week.
Notes

World number ones

No.	Player	Country	Start date	End date	Weeks	Total weeks
1	Annika Sörenstam	Sweden	21 February 2006	22 April 2007	60	60
2	Lorena Ochoa	Mexico	23 April 2007	2 May 2010	158^	158^
3	Jiyai Shin	South Korea	3 May 2010	20 June 2010	7	7
4	Ai Miyazato	Japan	21 June 2010	27 June 2010	1	1
5	Cristie Kerr	United States	28 June 2010	18 July 2010	3	3
	Ai Miyazato (2)	Japan	19 July 2010	25 July 2010	1	2
	Jiyai Shin (2)	South Korea	26 July 2010	15 August 2010	3	10
	Cristie Kerr (2)	United States	16 August 2010	22 August 2010	1	4
	Ai Miyazato (3)	Japan	23 August 2010	24 October 2010	9	11
	Cristie Kerr (3)	United States	25 October 2010	31 October 2010	1	5
	Jiyai Shin (3)	South Korea	1 November 2010	13 February 2011	15	25
6	Yani Tseng	Taiwan	14 February 2011	17 March 2013	109	109
7	Stacy Lewis	United States	18 March 2013	14 April 2013	4	4
8	Inbee Park	South Korea	15 April 2013	1 June 2014	59	59
	Stacy Lewis (2)	United States	2 June 2014	26 October 2014	21	25
	Inbee Park (2)	South Korea	27 October 2014	1 February 2015	14	73
9	Lydia Ko	New Zealand	2 February 2015	14 June 2015	19	19
	Inbee Park (3)	South Korea	15 June 2015	25 October 2015	19	92
	Lydia Ko (2)	New Zealand	26 October 2015	11 June 2017	85	104
10	Ariya Jutanugarn	Thailand	12 June 2017	25 June 2017	2	2
11	Ryu 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	Shanshan Feng	China	13 November 2017	22 April 2018	23	23
	Inbee Park (4)	South Korea	23 April 2018	29 July 2018	14	106
	Ariya Jutanugarn (2)	Thailand	30 July 2018	19 August 2018	3	5
	Park Sung-hyun (2)	South Korea	20 August 2018	28 October 2018	10	11
	Ariya Jutanugarn (3)*	Thailand	29 October 2018	Present	3	8

Key

Total weeks at No. 1

Rank	Player	Country	Weeks	Order	Majors
7000100000000000000♠1	Lorena Ochoa	Mexico	158	2	2
7000200000000000000♠2	Yani Tseng	Taiwan	109	6	5
7000300000000000000♠3	Inbee Park	South Korea	106	8	7
7000400000000000000♠4	Lydia Ko	New Zealand	104	9	2
7000500000000000000♠5	Annika Sörenstam	Sweden	60	1	10
7000600000000000000♠T6	Jiyai Shin	South Korea	25	3	2
	Stacy Lewis	United States		7	2
7000800000000000000♠8	Shanshan Feng	China	23	13	1
7000900000000000000♠9	Ryu So-yeon	South Korea	19	11	2
7001100000000000000♠T10	Ai Miyazato	Japan	11	4	0
	Park Sung-hyun	South Korea		12	2
7001120000000000000♠12	Ariya Jutanugarn*	Thailand	8	10	2
7001130000000000000♠13	Cristie Kerr	United States	5	5	2

Year end No. 1

Year	Player	Country
2006	Annika Sörenstam	Sweden
2007	Lorena Ochoa	Mexico
2008	Lorena Ochoa (2)	Mexico
2009	Lorena Ochoa (3)	Mexico
2010	Jiyai Shin	South Korea
2011	Yani Tseng	Taiwan
2012	Yani Tseng (2)	Taiwan
2013	Inbee Park	South Korea
2014	Inbee Park (2)	South Korea
2015	Lydia Ko	New Zealand
2016	Lydia Ko (2)	New Zealand
2017	Shanshan Feng	China

Weeks at No. 1 by country

As of 12 November 2018

Rank	Country	No. of players	No. of weeks	Players
1	South Korea	4	161	Jiyai Shin, Inbee Park, Ryu So-yeon, Park Sung-hyun
2	Mexico	1	158	Lorena Ochoa
3	Taiwan	1	109	Yani Tseng
4	New Zealand	1	104	Lydia Ko
5	Sweden	1	60	Annika Sörenstam
6	United States	2	30	Cristie Kerr, Stacy Lewis
7	China	1	23	Shanshan Feng
8	Japan	1	11	Ai Miyazato
9	Thailand	1	8	Ariya Jutanugarn

Active players are in bold.

Players who have reached No. 1 without having won a major title

Historical rankings

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:

• 25: South Korea


• 23: Japan


• 21: United States


• 6: Australia, Sweden


• 5: United Kingdom (England 3; Scotland 2)


• 4: Taiwan


• 2: France


• 1: Canada, Chile, Colombia, Denmark, Italy, Mexico, Norway, Philippines

Initial top ten 21 February 2006 Rank Player Country Points 1 Annika Sörenstam  Sweden 18.47 2 Paula Creamer  United States 9.65 3 Michelle Wie  United States 9.24 4 Yuri Fudoh  Japan 7.37 5 Cristie Kerr  United States 6.94 6 Ai Miyazato  Japan 6.58 7 Lorena Ochoa  Mexico 6.10 8 Jeong Jang  South Korea 4.91 9 Hee-Won Han  South Korea 4.49 10 Juli Inkster  United States 4.11

Initial top ten after 2 August 2006 formula change 7 August 2006 Rank Player Country Points 1 Annika Sörenstam  Sweden 17.41 2 Lorena Ochoa  Mexico 9.87 3 Karrie Webb  Australia 9.39 4 Paula Creamer  United States 8.13 5 Cristie Kerr  United States 8.04 6 Juli Inkster  United States 7.75 7 Michelle Wie  United States 6.83 8 Jeong Jang  South Korea 6.09 9 Yuri Fudoh  Japan 5.98 10 Ai Miyazato  Japan 5.79

See also

• 
  Official World Golf Ranking – for male professional golfers
  
  • List of World Number One male golfers
  
  


• 
  World Amateur Golf Ranking – for male and female amateur golfers

References

External links

• Official site with full list of all ranked players


• Official site with historical rankings of all players