March 18 (Reuters) - South Korean Kim Sei-young backed up her low opening round at the LPGA JTBC Founders Cup in Phoenix with another impressive effort on Friday, shooting a six-under 66 to move two shots clear.
Last season's rookie of the year, who shot a 63 on Thursday, moved to 15-under-129 at Wildfire Golf Club, two clear of Brittany Lang.
Lang started the day tied with Kim but dropped off the pace after a 68 on Friday. Jacqui Concolino (64) and Italian Giulia Sergas (68) share third at 12 under.
World number seven Kim has set her sights on a Rio Olympic berth and the 23-year-old, who won three times in 2015, came out firing with a birdie and eagle to start her round.