I must say this list looks quite ridiculous. Boxers will balk at seeing Ali 5th, whereas the best boxer ever - Sugar Ray Robinson - is not mentioned. I don't think Basketball aficionados will be impressed with Magic Johnson's inclusion and Michael Jordan's exclusion.
And I really don't think Bruce Lee would be 12th in a global survey....nor Callipatira 13th. Not to mention Ribot 14th, which - if anyone should wonder - is a horse.