(Reuters) - LPGA rookie Jang Ha-na took advantage of a late wobble by world number one Lydia Ko to grab a two-shot lead after the second round of the season-ending CME Group Tour Championship in Naples, Florida on Friday. South Korean Jang, hunting her first title on the U.S. circuit after ending up second three times this year, birdied four of her first six holes before finishing birdie-birdie for a seven-under-par 65 at Tiburon Golf Club. Twice major winner Cristie Kerr and fellow American Jennifer Song were a further stroke back at seven under after posting matching 69s. More...