WATCH: Day closes with quadruple bogey at US PGA

That Jason Day could still smile was a surprise.

The Australian appeared set to be in contention heading into the final round at the US PGA Championship before a forgettable 18th hole at Quail Hollow.

Day produced a quadruple bogey at the tough par-four hole, shooting a six-over 77 and ending the day at even par.

He hit his tee shot way right then found more trouble as he tried to get out of it, eventually making an eight.

Still, the 2015 champion was good enough to smile, perhaps wondering how it went so wrong.

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