Following her first major victory at the 2019 ANA Inspiration on Sunday, Jin Young Ko has ascended to No. 1 in the Rolex Women’s World Golf Rankings. Her three-stroke win at Mission Hills Golf Club in California vaulted her from fifth to the top of the standings.
“Reaching World No. 1 is exciting and I cannot believe that I have achieved this honour,” said Ko. “I always keep my focus on the golf course and on my playing, but to win a major championship and be called the best player in the world is absolutely a great honour. I want to thank my family, my caddie and my manager for all of their support.”
Ko is the fifth player from the Republic of Korea to reach World No. 1, following Inbee Park, Sung Hyun Park, So Yeon Ryu and Jiyai Shin. She is the third player to hold the title of World No. 1 in 2019, joining Ariya Jutanugarn and Sung Hyun Park, who was No. 1 for the previous five weeks.
History of the Rolex Women’s World Golf Rankings Number One Position
| # | Player | Age (Y/M/D) | From: | To: | No. Weeks |
| 29 | Jin Young Ko | 23/9/1 | April 8, 2019 | Present | 1 |
| 28 | Sung Hyun Park (3) | 25/5/13 | March 4, 2019 | April 7, 2019 | 5 |
| 27 | Ariya Jutanugarn (3) | 22/11/6 | October 29, 2018 | March 3, 2019 | 18 |
| 26 | Sung Hyun Park (2) | 24/10/29 | August 20, 2018 | October 28, 2018 | 10 |
| 25 | Ariya Jutanugarn (2) | 22/8/7 | July 30, 2018 | August 19, 2018 | 3 |
| 24 | Inbee Park (4) | 29/9/11 | April 23, 2018 | July 29, 2018 | 14 |
| 23 | Shanshan Feng | 28/3/8 | Nov. 13, 2017 | April 22, 2018 | 23 |
| 22 | Sung Hyun Park | 24/1/15 | Nov. 6, 2017 | Nov. 12, 2017 | 1 |
| 21 | So Yeon Ryu | 26/11/28 | June 26, 2017 | Nov. 5, 2017 | 19 |
| 20 | Ariya Jutanugarn | 21/6/20 | June 12, 2017 | June 25, 2017 | 2 |
| 19 | Lydia Ko (2) | 18/6/2 | October 26, 2015 | June 11, 2017 | 85 |
| 18 | Inbee Park (3) | 26/11/3 | June 15, 2015 | October 25, 2015 | 19 |
| 17 | Lydia Ko (1) | 17/9/9 | February 2, 2015 | June 14, 2015 | 19 |
| 16 | Inbee Park (2) | 26/3/15 | October 27, 2014 | February 1, 2015 | 14 |
| 15 | Stacy Lewis (2) | 29/3/17 | June 2, 2014 | October 26, 2014 | 21 |
| 14 | Inbee Park (1) | 24/9/3 | April 15, 2013 | June 1, 2014 | 59 |
| 13 | Stacy Lewis (1) | 28/1/2 | March 18, 2013 | April 14, 2013 | 4 |
| 12 | Yani Tseng | 22/0/22 | February 14, 2011 | March 17, 2013 | 109 |
| 11 | Jiyai Shin (3) | 22/6/4 | November 1, 2010 | February 13, 2011 | 15 |
| 10 | Cristie Kerr (3) | 33/0/13 | October 25, 2010 | October 31, 2010 | 1 |
| 9 | Ai Miyazato (3) | 25/2/4 | August 23, 2010 | October 24, 2010 | 9 |
| 8 | Cristie Kerr (2) | 32/10/4 | August 16, 2010 | August 22, 2010 | 1 |
| 7 | Jiyai Shin (2) | 22/2/28 | July 26, 2010 | August 15, 2010 | 3 |
| 6 | Ai Miyazato (2) | 25/1/0 | July 19, 2010 | July 25, 2010 | 1 |
| 5 | Cristie Kerr (1) | 32/8/16 | June 28, 2010 | July 18, 2010 | 3 |
| 4 | Ai Miyazato (1) | 25/0/2 | June 21, 2010 | June 27, 2010 | 1 |
| 3 | Jiyai Shin (1) | 22/0/5 | May 3, 2010 | June 20, 2010 | 7 |
| 2 | Lorena Ochoa | 25/5/8 | April 23, 2007 | May 2, 2010 | 158 |
| 1 | Annika Sorenstam | 35/4/11 | February 20, 2006 | April 22, 2007 | 61 |
Career weeks at Rolex Women’s World Golf Rankings Number One Position
| Lorena Ochoa | 158 weeks |
| Yani Tseng | 109 weeks |
| Inbee Park | 106 weeks |
| Lydia Ko | 104 weeks |
| Annika Sorenstam | 61 weeks |
| Stacy Lewis | 25 weeks |
| Jiyai Shin | 25 weeks |
| Ariya Jutanugarn | 23 weeks |
| Shanshan Feng | 23 weeks |
| So Yeon Ryu | 19 weeks |
| Sung Hyun Park | 16 weeks |
| Ai Miyazato | 11 weeks |
| Cristie Kerr | 5 weeks |
| Jin Young Ko | 1 week |
