By Andrew Both AUGUSTA, Georgia, April 7 (Reuters) - A subdued Rory McIlroy lamented two late bogeys that left him four strokes behind leader Jordan Spieth after the opening round at the Masters on Thursday. McIlroy was compiling a round of the highest order in brutal afternoon conditions before settling for a two-under-par 70 at Augusta National. "I let a couple of shots get away on 16 and 18 but if someone had given me a 70 on the first tee, I probably would have taken it," the Northern Irishman told reporters as the sun dipped below the Augusta pines. More...