(Reuters) - Brooks Koepka fired a three-under-par 67 for a one-shot lead after the second round of the FedEx St. Jude Classic in Memphis on Friday. Big-hitting Koepka made four birdies and a single bogey to move to nine under for the tournament, with Austin Cook a shot behind after one of the day’s top rounds, a six-under 64. Cook is playing on a sponsor’s exemption but is trying to prove that he belongs on Tour. More...