Sweden's Peter Hedblom is one of four players tied for the lead after the first round of the Perth International.
Hedblom, along with James Nitties, Clint Rice and Jeong Jin all recorded rounds of 68 at the Lake Karrinyup Country Club in Australia.
World number 21 Dustin Johnson is a shot back on three-under-par alongside Fredrik Andersson-Hed and England's Sam Little.
Bo van Pelt is a shot further adrift on two-under, while Paul Casey could only produce a disappointing round of 76 to leave him eight off the pace.
