The richest sportsman in the world is considered to be Floyd Mayweather with a net worth estimated at around $505 million. He is a retired American professional boxer and has been consistently ranked as one of the highest-paid athletes in the world. Other notable names on the list of richest athletes include Cristiano Ronaldo, Lionel Messi, Neymar, and LeBron James, who all have a net worth of over $500 million.