The player known as the "King of Clay" in tennis is Rafael Nadal. The nickname is a testament to his unparalleled success on clay courts, where he has achieved extraordinary feats and dominated the competition.
Rafael Nadal, a Spanish tennis sensation, has an exceptional record on clay, particularly at the French Open (Roland Garros). As of my last knowledge update in September 2021, Nadal had won a record-breaking 13 French Open titles, the most by any player in the tournament's history. His remarkable ability to slide on clay, generate heavy topspin, and play with relentless determination has made him virtually unbeatable on this surface.
Nadal's supremacy on clay, combined with his immense talent and numerous other achievements, has solidified his status as one of the greatest tennis players of all time. His "King of Clay" title is well-deserved and reflects his legendary status on this surface.