* Gainey on track for second consecutive win * Trails Korean Wi by one shot after first round (Adds detail, quotes) Nov 8 (Reuters) - Three weeks after clinching his maiden PGA Tour victory, Tommy Gainey put himself in position for a repeat win as he charged into contention for the Children's Miracle Network Classic at Lake Buena Vista, Florida on Thursday. The 37-year-old American with an unconventional swing fired a seven-under-par 65 on the Palm course, one of two layouts hosting the final PGA Tour event of the season, to end the opening round a stroke off the lead. ... More...