- South African Branden Grace had seven birdies in a six-under par 66 on Thursday to take a one-stroke lead after the first round of the PGA Tour's Texas Open. Will MacKenzie, John Huh, Steven Alker and Stewart Cink shared second on 67. Huh had five birdies without a bogey in his five-under effort. It was a further stroke back to a big group on 68 that included former US Open champion Graeme McDowell of Northern Ireland, Brooks Koepka and South Korean Noh Seung-Yul. Ken Duke was also at four-under after a round that included holing out from a bunker for an eagle at 14. Defending champion Charley Hoffman carded a 71, while Curtis Luck, the 2016 US Amateur champion from Australia who is making his professional debut, signed for a 73.