4. Jason Day, 19, Australia
The Stats: Day became the youngest winner of a Tour-sanctioned event (19 years, 7 months, 26 days) with his victory at the Nationwide's Legend Financial Group Classic in July. He took up golf at 7 and excelled as a tyke, but he almost quit the game at 11 after his father, Alvin, died of cancer. Day drank heavily for a spell after his father died, but he got back into golf while attending a boarding school in Australia and quickly became one of the country's winningest amateurs. Currently ranked third on the Nationwide Tour money list, he'll be a Tour rookie in '08.
The Skinny: Stellar putting (7th on the Nationwide) and huge driving (4th, 306.8 yards) give him the tools to do something no other Australian has ever done: win the green jacket at Augusta.