Michael Phelps signs off with 18th Olympic gold

As if 22 medal ceremonies over the last three Olympics weren't enough, Michael Phelps was summoned back to the pool deck for one more accolade.

This time, he received a trophy rather than a medal, an award that sought to sum up a career like no other.

"To Michael Phelps," it said, "the greatest Olympic athlete of all time."

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Video courtesy USAOlympian