Yahoo Sports reports: Former US Open champion Wyndham Clark remained top of a stacked leaderboard after the second round at Shinnecock Hills but he is being stalked by a number of multiple major winners. Rory McIlroy looked like being the man to challenge the American’s seven-under total but, after missing a six-footer at the ninth which would have moved him to within three, a chaotic back nine saw him shoot 71 and finish the day seven behind.