LYTHAM ST ANNES, England (Reuters) - At the U.S. Open two years ago it was Graeme McDowell who kept calm when everyone around him wilted on a nervy final day but he could not repeat the act in a similarly frantic British Open climax. McDowell, partnering Adam Scott in the final group of the day as the Australian's heartbreaking collapse handed Ernie Els a fourth major title, moved within three ...