July 5 (Reuters) - The teenagers at the top of women's golf, Lydia Ko and Brooke Henderson, form a mutual admiration society and a burgeoning rivalry that will feature at the U.S. Women's Open starting on Thursday.
World number one Ko of New Zealand and second-ranked Canadian Henderson, one year younger at 18, have won the year's first two majors and tee off together in the first round of the Open at CordeValle in San Martin, California.
The Korean-born Ko won the Ana Inspiration in March and Henderson claimed her first major last month at the Women's PGA Championship.