South Korean Kim In-kyung took a two-shot lead at 4-under in the second round of the U.S. Women's Open on Friday in Colorado.Kim still has four holes left to finish in the second round as play was called due to a thunderstorm.The 23-year-old, who has yet to make a bogey on the course, notorious for difficult conditions, shot a 1-under 70 on Thursday.Shin Ji-yai, another South Korean, finished her second round at 2-over to rank 18t