By Jon Wertheim The Spaniard extended his men’s record with a straight-sets win over Casper Ruud, further surpassing the career marks of both Novak Djokovic and Roger Federer. PARIS — The king of Spain was in the stands of Roland Garros on Sunday. So was the king of Norway, so was Billie Jean King. They had all come to see the king of clay, Rafael Nadal, and he did not disappoint. Under a beautiful Paris sky, Nadal won his 14th French open title, beating Casper Ruud of Norway, 6-3, 6-3, 6-0. He’s won this tournament for the 14th time, having won all but four years since 2005. Nadal’s track rec…