Katie Ledecky was only racing against herself in the 400-meter freestyle on Sunday night, and she succeeded.
The 19-year-old won the gold medal by beating her own world record time in 3:56.46, beating the field by more than five seconds.
American Leah Smith took the bronze with a time of 4:01.92, just behind Great Britain’s Jazmin Carlin, who took silver.
..... - Newsday