Ko has been the most consistent and dominant players in women's professional golf for the past four years, first rising to No. 1 in the Rolex Rankings in 2019, and hovering near the top ever since. Of her 26 worldwide victories, 15 have come on the LPGA Tour, including major titles in 2019 at the Chevron Championship and Amundi Evian Championship. She also tied for second at the 2020 U.S. Women's Open at Champions Golf Club in Houston. In March, Ko successfully defended her HSBC Women's World Championship title in Singapore. From 2014-17, Ko won 10 times on the LPGA of Korea Tour. When she won the 2017 LPGA KEB Hana Bank Championship, a co-sanctioned event with the LPGA Tour and KLPGA, Ko took up membership on the LPGA Tour for the 2018 season. Her best season to date on the LPGA Tour was 2021 when she posted five victories. She will celebrate her 28th birthday during Round 2 of this year's U.S. Women's Open.