Looked a bit shaky on the home stretch, but nothing like Augusta. Maybe he was trying to coast home and not take unnecessary chances.
I'm not sure I would call an even par back nine at the US Open with a birdie, bogey, par on the last 3 holes shakey. He may have let his foot off the accelerator on 17 with a 9 stroke lead and 2 holes to play and was coasting a little. His reaction to the bogey on 17 was what you would have hoped it would be. He put his approach on 18 right where he should have given he was hitting from the rough with water on the left. Then he put an 80' putt from the fringe about 6" from the hole. For me, the most impressive part of his final round was the first 5 holes. He answers Lee Westwood's birdie on 1 with his own birdie, drills two par saving putts from that dangerous 5' to 10' range and makes another birdie on 4. He clearly sent a message to the field that it was game over, have fun playing for 2nd. Then he topped that with a near ace on 10, one of the toughest holes on the course.
I think he is a great kid and will be a real asset to the tour. He never got upset with the constant references to what happened on Sunday at the Masters. He handled those questions professionally and with grace, and then let his golf game close the book on what happened at the Masters.