Surprisingly, the "World's Highest-Paid Athletes 2018" compilation is an all-male affair with no women being featured in the list.
Forbes estimated that in the last 12 months as of June 1, she earned $18 million, which put her below the 100th athlete on the 2018 list ― National Basketball Association player Nicolas Batum, who earned $22.9 million.
The Irishman would have only needed to earn an additional $13 million from that bout to put him in second place ahead of soccer stars Lionel Messi (No. 2 with $111 million in earnings) and Cristiano Ronaldo (No. 3 with $108 million in earnings).
Serena Williams - victor of 23 grand slam tennis singles titles - was past year the sole female representative, but she has since largely been inactive, owing to pregnancy and giving birth to her daughter Alexis in September. This was due mainly to his cross-combat superfight against mixed martial arts star Conor McGregor in August 2017.
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It will come as no surprise that being talented at a sport is a good way to become a multi-millionaire, as Forbes' list of the world's 100 highest-paid athletes proves. There are no hockey players on the list. His estimated earnings, including endorsements, for 2017 were $285 million. Brazil global Neymar is the third football star in the top five.
At 47, golfer Phil Mickelson is the oldest athlete on the list, while 23-year-old Milwaukee Bucks star Giannis Antetokounmpo is the youngest and he rounds up the top 30. The top 100 earned United States dollars 3.8 billion, a 23 per cent jump over past year.
Though the list of leading athletes consists of players from 11 different sports, basketball takes over the list with a top score 40 NBA players among the top 100, up from 32 in 2017.
Lewis Hamilton remained the highest paid British sports star on the list in the 12th place, with earnings of $51m (£38.2m). However, that was about $5 million less than National Basketball Association player Nicolas Batum, who landed the 100th spot on the list.