HILTON HEAD ISLAND, S.C. (AP) — Cameron Smith birdied the difficult 17th and 18th holes at Harbour Town to shoot a 9-under 62 and take a one-stroke lead over Stewart Cink at the RBC Heritage. Smith followed up his second top-10 finish at the Masters in five months by matching the lowest opening round at the Heritage. The 47-year-old Cink is a two-time champion at Harbour Town who’s enjoying a resurgence this season. PGA Championship winner Collin Morikawa and Matt Wallace were three shots back. World No. 1 Dustin Johnson opened with a 70. He played with Masters runner-up Will Zalatoris, who shot 68.