who is the richest sports person in the world 2018?
['Floyd Mayweather: $285 million (£214 million)', 'Lionel Messi: $111 million (£83 million)', 'Cristiano Ronaldo: $108 million (£81 million)', 'Conor McGregor: $99 million (£74 million)', 'Neymar: $90 million (£67 million)', 'LeBron James: $85.5 million (£64 million)', 'Roger Federer: $77.2 million (£58 million)']