Ledecky Breaks World Record

There was little doubt that Katie Ledecky would touch the wall first in the 400-m freestyle. The world-record holder in the event, at this point the 19-year-old from suburban Maryland is racing against herself. Each time she dives into the water, she’s swimming to beat her own last personal best.

And that’s exactly what Ledecky did in Rio on day two of the Olympic swimming events.