Katie Ledecky was the fastest swimmer in the pool, and she brought her American teammates along for the ride Ledecky, 19, did that Wednesday, taking the third gold medal and fourth medal overall of her Olympics, this one as the anchor leg of the victorious women’s 4x200-meter freestyle relay team She is delivering in the way others can only fantasize about, the latest a sizzling leg that turned what looked like a massive deficit into a walk-in-the-park advantage, taking over for teammate Maya DiRado and simply putting away Australia