Leading first-round scores on Thursday in the US PGA Tour Puerto Rico Open in Rio Grande, Puerto Rico (USA unless noted, par-72): 64 - Kyle Stanley 66 - Peter Uihlein, Josh Teater, Emiliano Grillo (ARG), Chris Couch, Henrik Norlander (SWE), Rhein Gibson (AUS) 67 - Martin Laird (SCO), Jay McLuen, Scott Brown, MJ Daffue (RSA), Wes Roach, Julian Etulain (ARG) 68 - Robby Shelton, Ted Potter, Kiradech Aphibarnrat (THA), Viktor Hovland (DEN), Jhonattan Vegas (VEN), Mark Anderson afp