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In pictures: Federer, Woods, Ronaldo, Messi, Murray and more - the world's 30 most marketable sportsmen and women in the world

Which injured tennis star earns as much as Cristiano Ronaldo and Lionel Messi combined? And how does Kei Nishikori earn the same amount as Usain Bolt, Serena Williams and Maria Sharapova? Researchers at the London School of Marketing have crunched the numbers and found only 3 Brits make the list of the most marketable athletes in the world, while Tiger Woods is still in the top 5 highest-earning sportsmen in the world.