AUGUSTA, Georgia, April 11 (Reuters) - Rory ⁠McIlroy arrived at Augusta National on Saturday with one arm already slipped into the Green Jacket ⁠but the defending champion left the course with a fight on his hands.

The Northern Irishman had ‌built the biggest 36-hole lead in Masters history and looked to be barrelling toward a stress-free Sunday stroll around Augusta National.