By TOM PERROTTA ReutersRafael Nadal’s four-set victory over Roger Federer on Sunday in Paris gave him his sixth French Open championship. PARIS—Wasn’t this the French Open that was supposed to be different? Well, so much for that. It’s early June here and, as ever, Rafael Nadal is the French Open champion after a 7-5, 7-6(3), 5-7, 6-1 victory over Roger Federer. This was Nadal’s sixth title, a feat that puts him alongside Bjorn Borg, the only other man to win six times here, and above everyone else who has mastered the crushed red brick of Roland Garros. And there’s a strong case to be made that he has left Borg behind,…