Rafael Nadal is a professional tennis player from Spain who is widely considered one of the greatest players of all time. He is known for his dominance on clay courts, and has won a record 12 French Open titles. He is also a two-time Olympic gold medalist and has won 19 Grand Slam singles titles in total. His nickname is 'The King of Clay' and he is often referred to as 'Rafa' on the tennis court.