Not a single woman has been included among the world's top 100 earning sportspeople - the first time it has been entirely populated by men since Forbes began compiling an extended list eight years ago.
Forbes reported that Mayweather, 41, topped sports highest-earners after banking $275 million dollars from his cross-combat superfight against mixed martial arts star Conor McGregor in August 2017.
Mayweather's significant earnings from last year's fight with Irishman Conor McGregor made him the world's best paid for the fourth time in seven years, with $285m (£212.8m).
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A further $14 million in endorsements took the Irish fighter's earnings to $99 million, just behind Real Madrid soccer star Cristiano Ronaldo, who was third with earnings of $108 million.
Mixed-martial arts and UFC star McGregor is fourth on the list and is joined in the top ten by Brazil footballer Neymar, basketball players LeBron James and Steph Curry, tennis ace Roger Federer and National Football League quarterbacks Matt Ryan and Matthew Stafford.
The previous year, the 2.16m basketballer earned a paltry $US3.1m. Forbes says 40 basketball players were among the top 100 thanks to a "soaring salary cap triggered by the NBA's $24 billion TV contract". Five golfers, four boxers and four tennis players also made the list.