New Zealand teenager Lydia Ko, after becoming the youngest two-time major winner over the weekend, validated her No. 1 spot in the Rolex Women's World Golf Rankings released Monday.
The 18-year-old Ko won the ANA Inspiration at Mission Hills Country Club's Dinah Shore Tournament Course in Rancho Mirage, Calif., on Sunday.
Ko won the Evian Championship in September in France to become the youngest female major champion. Ko, who turns 19 this month, now has 12 LPGA Tour victories and remains No. 1 in the rankings for the 24th consecutive week.
Ko (14.28-point average) is comfortably ahead of South Korea's Inbee Park (9.83)
Thompson finished fifth in the ANA Inspiration, Park tied for sixth and Lewis tied for 18th.