Michael Phelps and Conor McGregor have both fallen short against unconventional challengers this summer. While the Olympic swimmer couldn't record a faster time than a shark, the MMA fighter lost a boxing match to Floyd Mayweather.

Both were unnecessary stunts, so what's one more strange competition?

Phelps jokingly—at least, one would hope—challenged McGregor to a race on Tuesday. Sure, the renowned swimmer with 28 Olympic medals holds a distinct advantage, but McGregor could draw interest by just shouting while treading water.

Perhaps he will then play one-on-one against Kevin Durant and see if he can hit more home runs than Giancarlo Stanton.

[Michael Phelps]