Is polevaulter Duplantis the most dominant athlete in sports history?

I just checked betting markets (bet365) for the olympics and swedish-american polevaulter Armand Duplantis is 1.03 (-3333) to win the gold lol. Is he the most dominant athlete in the history of all sports? As far as being a current betting favorite to win large event goes.

I know for example Mayweather has a ridiculous record of wins after the fact, but he was never close to this much of a favorite going into a match was he?