(Reuters) - After a dose of positive reinforcement, Lydia Ko aced her second round at the season-ending CME Group Tour Championship with a tournament record 62 that catapulted her into a three-shot lead in Naples, Florida, on Friday. Ko was seen working into the night on Thursday with instructor David Leadbetter after carding an opening 70 that left her four strokes behind pace-setter Shanshan Feng of China. “Brings back a lot of great memories," said world number one Ko, the Olympic silver medallist who has gone without a victory in her last nine events. More...