* Jang fires 65 to leapfrog Ko * Holds 36-hole lead for fifth time this year (Adds quotes, detail) Nov 20 (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. For the fifth time in her rookie season, Jang holds the 36-hole lead but she does not want to look too far ahead. More...