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In the world of , who is the greatest of all time?

achievements in 1936 give credence to his claim, while stunning run of 9.9 seconds at the Mexico 1968 Games set a new world best that would not be beaten for 15 years.

Then of course, there was decade of domination in the 1980s, when he became the only man to retain his 100m crown.

Or maybe Britain's own should be in the running after following the silver he won in Seoul with a gold in Barcelona.

However, one man has already appointed himself as the greatest of all time, even going so far as to have the acronym GOAT etched into his skin.

That man is, of course, , who knocked the biggest chunk off the world record in one go since the introduction of electronic timing, to set a new mark of 9.79 seconds in 1999 - a record that stood for two days shy of six years.

He didn't quite live up to his own high standards at the Sydney 2000 Olympics, but won gold in a time of 9.87 seconds.

Greene was third four years later in Athens despite running 9.87 again and finishing just two hundredths of a second behind winner .

Who does your vote go to?