Ko holds 5-stroke lead

Lydia Ko is in total control at the halfway mark of the CME Group Tour Championship in Naples, Fla. Total control of the season-long scoring and money races, too. Ko shot a 6-under 66 in Friday’s second round of the LPGA Tour’s season finale, pushing her to 13 under for the tournament and five shots clear of Hyo Joo Kim through 36 holes. Ko made four birdies in a six-hole stretch midway through her round, rolled in a testy 4-footer to save par on the par-4 13th to maintain what was then a four-shot lead, and hasn’t dropped a shot since her opening hole on Thursday. Former University of Arkansas golfer Stacy Lewis is tied for 10th at 5-under 139. Gaby Lopez (Razorbacks) is at 3-under 141.