Women's World Golf Rankings

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.

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; indeed 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.

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. This modification did not have an immediate impact on the rankings.

Criticisms

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.

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. Four of the 12 places in the European Solheim Cup team are allocated on the basis of the rankings.

Starting in 2013, the rankings at the end of each LPGA Tour season in odd-numbered years will determine 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.

Current top ten

As of 2 May 2016

Rank	Change	Player	Country	Points
1		Lydia Ko	New Zealand	13.77
2		Inbee Park	South Korea	9.40
3		Lexi Thompson	United States	7.41
4		Stacy Lewis	United States	6.32
5		Brooke Henderson	Canada	6.22
6	1	Kim Sei-young	South Korea	6.21
7	1	Chun In-gee	South Korea	6.05
8	1	Amy Yang	South Korea	5.83
9	1	Jang Ha-na	South Korea	5.78
10		Ryu So-yeon	South Korea	4.92

Change column indicates change in rank from previous week.
Notes

• On 12 January 2009, Annika Sörenstam, who was ranked 3rd the previous week despite having announced her retirement effective at the end of the 2008 season, was removed from the rankings. No official explanation was given for her removal. Sörenstam later posted in her personal blog that she asked to be removed.
• On 10 May 2010, one week after announcing that she was retiring from golf, Lorena Ochoa also voluntarily removed herself from the rankings. Her last position in the rankings was number 2 for the week of 3 May 2010.

World number ones

As of 2 May 2016

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	10	12
	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	Current	28	47

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

Green shading indicates the player was No. 1 throughout the year.

Weeks at No. 1 by country

Rank	Country	No. of players	No. of weeks	Players
1	Mexico	1	158	Lorena Ochoa
2	South Korea	2	117	Jiyai Shin, Inbee Park
3	Taiwan	1	109	Yani Tseng
4	Sweden	1	60	Annika Sörenstam
5	New Zealand	1	47	Lydia Ko
6	United States	2	30	Cristie Kerr, Stacy Lewis
7	Japan	1	12	Ai Miyazato

As of 2 May 2016
Active players are in bold.

Players who have reached number one without having won a major title

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

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

External links

• Official site with full list of all ranked players
• Official site with historical rankings of all players