Merely mention “tennis”, and Rafael Nadal will be one of the first names to come to mind. Known as the “King of Clay” for his ability on that type of courts, he is one of two male tennis players to have 20 grand slam titles under his belt (the other being long-time rival and friend Roger Federer).According to Forbes, the Spanish player has won over US$121 million in prize money since he went pro in 2001; this is on top of his endorsements for brands such as Nike, Babolat and Kia. Celebrity Net…
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