3: Lightweight mixed martial arts contender Conor McGregor made $47 million.
Conor McGregor is known around the world as a mixed martial artist, but Forbes says he is making an increasing amount of cash from his sponsorship deals and his whiskey business.
The Irishman is one of the fight game's most captivating characters because of his merciless trash talk, his showboating in the cage, and his concussive punching.
Last October, he returned to the Octagon for the first time in almost two years but was convincingly beaten by lightweight rival Khabib Nurmagomedov. He reportedly earned a guaranteed $3 million, according to Forbes, with an extra $30 million generated because of the event's popularity at the box office.
McGregor's whiskey brand, Proper no. Twelve, is proving a hit with consumers. His business partner Ken Austin told Business Insider that the company had sold around 200,000 cases. There are even plans to create more expressions as it looks to rival Jameson's as the most popular Irish whiskey on the market.
Joshua was a silver medalist at the World Amateur Championships in 2011, a gold medal winner at the 2012 Olympic Games, and the unified heavyweight boxing champion until earlier this month when he was upset in the seventh round of an up-and-down barnburner with Andy Ruiz Jr.
His popularity is what convinced the market-disrupting streaming service DAZN to pay $365 million for 11 of Alvarez's bouts, the first of which was an easy knockout win over Rocky Fielding, before a decision victory over Daniel Jacobs, last month.