Rafael Nadal is a professional tennis player from Spain who has won numerous Grand Slam titles and is widely regarded as one of the greatest players of all time. He is often referred to by his nickname, 'Rafa, ' and is commonly known as 'The King of Clay' due to his dominance on the surface. Nadal has been ranked world number one in both singles and doubles, and has won 19 Grand Slam singles titles, the second-most in history.