Katie Ledecky has been the dominant women's swimmer in the world the last couple of years, and has become known as much for her almost robotic precision as her record-breaking times.

After shattering yet another world record Sunday night in winning the 400-metre freestyle in three minutes, 56.46 seconds, Ledecky offered up as much emotion as you'll get from her, with a fist-pump in the water and understated joy after getting out of the pool.

"I'm pumped," Ledecky said. "I was so close to breaking it [this morning]. I felt good throughout.

"The swim was almost identical to this morning, but with a bit more pop on the last lap. It's pure happiness."

Pure dominance, as well, with Ledecky finishing nearly five seconds ahead of silver medallist Jazz Carlin of Great Britain (4:01.23). In fact, the 19-year-old American had time to touch the wall, turn around, and check out the scoreboard before Carlin and US bronze medalist Leah Smith (4:01.92) finished.

"I could hear the crowd going crazy and knew Katie was doing something special," said Smith. "So that was cool."

Ledecky greeted Smith with an excited embrace, thrilled to have a team-mate alongside her when she's accustomed to being alone out in front.

"It's so good to have her on the podium, too," Ledecky added.

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