Katie Ledecky emphatically announced herself to the 2016 Rio Olympics audience with a dominating, record-setting performance in the 400-meter freestyle on Sunday night.

Ledecky broke her own world record, beating her closest competitor by nearly five seconds. It was her second medal of the games -- she won silver in the 4x100m freestyle relay on Saturday.

The 19-year-old is far from done, and hopes to win three more gold medals at the Rio Olympics.

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Katie Ledecky is hoping for five medals at the Rio Olympics. Getty Images

How to watch (TV coverage on NBC, live stream on NBCOlympics.com)

All times Eastern

800m freestyle

Heats: Thursday, Aug. 11 - 12:26 p.m.

Final: Friday, Aug. 12 - 9:20 p.m.