LeBron James is the highest paid though he is not the richest, there are several richer sports men who earned their money through competition winnings as apose to weekly salary
Floyd Mayweather Jr. is the most richest sports person in the world. The is the sports person for boxing.
Tiger Woods is the most expensive athlete in the world. He gets paid 75 million a year.
Kimi Raikkonen at Ferrari
Mahendra Singh Dhoni
A paid athlete is consider a professional athlete.
this could be a question of opinion. World class soccer players and Formula 1 racing drivers are some of the highest paid athletes in the world.