Rafael Nadal’s tennis career will be remembered because of the numbers, yes — the 14 French Open trophies, the 22 Grand Slam titles overall, the nearly two decades in the top 10, and so on — and, without a doubt, because of his riveting rivalries with Roger Federer and Novak Djokovic. If anything, it is remarkable that he lasted as long as he did; the 38-year-old Nadal said his farewell will come next month when he represents Spain in the Davis Cup finals. “Really, everything I have experienced has been a dream come true,” Nadal said in a video posted on social media that included a montage of clips from his career, including handshakes at the net after matches against Federer and Djokovic, the other members of the so-called Big Three of men’s tennis.