Lee, the 18-year-old from New Zealand who became the youngest U.S. amateur champion in history, built a 2-up lead at the turn and closed out Saxton with a par on the 17th hole for a 2-and-1 victory at The Golf Club of Georgia.
Lee plans to turn pro after the Masters next week. A native of South Korea, he won the Johnnie Walker Classic in Australia last month on the European Tour, beating a field that included Anthony Kim and Camilo Villegas.
The course was fantastic, Lee said. I think it will be great preparation for the Masters, playing greens this fast.
Saxton, a 21-year-old from The Netherlands who also will play at Augusta National next week, plans to turn pro in the summer.
Lee took control with a 3-wood from the rough that carried 250 yards over a bunker to within 15 feet, setting up a two-putt birdie on the ninth hole for a 2-up lead. Saxton birdied the 10th hole, but hit his next tee shot out-of-bounds and never got any closer.