As Michael Phelps ducked his damp head on Tuesday night to receive the 15th Olympic gold medal of his phenomenal career, two of his supporters high up in the crowd frantically waved a home-made banner that read, in wonky script - Phelps: Greatest Olympian ever.
That gold in the 4x200m freestyle, plus the silver he had to settle for an hour earlier having led the 200m butterfly until the final fingertip, took his tally to 19 Olympic medals.
Undisputedly, Phelps is the most decorated athlete in Games history. But the greatest?
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