England's Poulter, who was one of the early starters to benefit from a lighter breeze and smoother greens on the fast-running course, shared a tie for fourth with Spanish debutant Rafael Cabrera-Bello, South Korea's KJ Choi, Canada's 2003 Masters champion Mike Weir, Germany's Alex Cejka and Japanese 18-year-old Ryo Ishikawa.
BBC: US Open: Paul Casey ties for lead at Pebble Beach