By Matt Hardy The term GOAT – greatest of all time – gets banded around far too much in sport. But when it comes to being King of Clay, a Royal of Roland Garros and the French Open, there’s only one name on anybody’s lips. Rafael Nadal has won the French Open 14 times, beating eight different opponents in the showpiece match. His 14 titles stretch across four periods, three of which have seen him win at least four in a row. His dominance on the orange stuff is remarkable with players like Novak Djokovic and Roger Federer falling to the Spaniard. But this could be it for the 37-year-old. It is …