(Reuters) - South Korea's Lee Mi-rim birdied five of her last seven holes to cap an "easy day" and surge into an early three-stroke lead in Thursday's opening round of the U.S. Women's Open in San Martin, California. Taking advantage of ideal scoring conditions at sun-splashed CordeValle Golf Club, the 25-year-old fired an eight-under-par 64 to match the second-best U.S. Women's Open score ever in the third of the year's five women's major championships. Only Swede Helen Alfredsson, with an opening 63 at the 1994 U.S. Women's Open, has gone lower while Americans Kelli Kuehne and Becky Iverson, Canadian Lorie Kane and South Korean Chella Choi have also carded 64s at the tournament. More...