Germany's Caroline Masson shot a 7-under 65 on Friday to take a surprising one-stroke lead after the second round of the Women's British Open. Playing in the last group of the day, the 22-year-old Masson had seven birdies without a bogey on the Carnoustie Golf Links to move to 11-under 133, one stroke ahead of South Korea's Inbee Park and Meena Lee. Masson, competing in only her second season on the European Tour, had four birdies in a front-nine 32.