Although the world number one hit back with a birdie-three on nine, he was well out of contention and his closing 75 left him in a share of 15th place at two-over 290.
"I got off to an ideal start and was one under through two," said the world number one.
"I just made a mental blunder on three and it ended up costing me big mo [momentum]. It was a bad decision."
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