(Updates after Snedeker round completed) MELBOURNE, Dec 3 (Reuters) - Tournament favourite and headline act Brandt Snedeker endured a nightmare start to the Australian PGA Championship on Thursday after crashing to a 12-over-par 83 at the RACV Royal Pines Resort on the Gold Coast. American Snedeker has won seven times on the elite U.S. PGA Tour but looked more like a weekend hacker when he crashed to seven over after just four holes. Starting his round at the 10th, he had back-to-back bogeys before a double on the par-five 12th followed by a triple-bogey seven on the 13th. ... More...