London, England (Sports Network) - American teenager Katie Ledecky won the 800-meter freestyle Friday night after swimming much of the race under world record time.
Ledecky, 15, blew away the seven other swimmers in the field, leading for good after the first 150 meters. She touched in 8 minutes, 14.63 seconds -- 4.13 ticks ahead of Spain's Mireia Belmonte Garcia.
Great Britain's Rebecca Adlington, the world record holder and 2008 gold medalist, ended 5.69 seconds back. Ledecky was ahead of Adlington's world record time of 8:14.10 until the last 50 meters. She finished just .53 off it.
08/03 15:05:53 ET