Birdies on his last three holes Saturday left Matias Dominguez of Chile with a 3-under 69 and a one-shot lead going into the final round of the inaugural Latin America Amateur Championship.
The Texas Tech senior is at 10-under 206, one shot ahead of 18-year-old Alejandro Tosti of Argentina, who shot 68.
The winner will get a spot in the Masters, as well as the U.S. and British Amateurs. He also will be exempt into the final stage of qualifying for the U.S. and British Opens.
Juan Sebastian Munoz of Colombia (71) and Joaquin Bonjour of Argentina (73) are four shots back, at 6 under. Second-round leader Andre Tourinho of Brazil is five shots off the lead after making a triple bogey on the par-4 15th hole and shooting 75.
''It's been awhile since I've led a tournament,'' Dominguez said. ''I'm used to coming from the back. I will just try to stay in the present and go shot-by-shot.''
Tosti, who plans to enroll at Florida later this month, has a home-course advantage at Pilar Golf Club in Buenos Aires. He trains at the Argentine Golf Association's performance center there.
''I know I'm playing really well, and it's a really good position,'' Tosti said. ''With all my experience playing here, I think I have an advantage.''
If Dominguez wins, he will be the first player from Chile in the Masters since 1964, when Enrique Orellana missed the cut.