By Ben Everill PONTE VEDRA BEACH, Florida, May 7 (Reuters) - Rory McIlroy outplayed Jordan Spieth in a duel between the world's two top-ranked players, but another young gun stole the show with the clubhouse lead during the opening round of the Players Championship on Thursday. Hideki Matsuyama, of Japan, fired a five-under 67 to take the lead at TPC Sawgrass, one shot ahead of Americans Billy Horschel, Ben Martin and Troy Merritt with half the field back in the clubhouse in the $10 million event. More...