At the 2012 Summer Olympics in London, Ledecky qualified to swim in the final of the 800-meter freestyle by placing third overall in the heats with a time of 8:23.84. In the final, Ledecky stunned the field, winning gold by more than four seconds, with a time of 8:14.63, the then second-fastest effort of all time just behind Rebecca Adlington's world record of 8:14.10 set in 2008. In addition, she broke Janet Evans' American record of 8:16.22 that had stood since 1989. In the final, Ledecky went out hard and, by the 200-meter mark, she had already established an almost body-length lead. Her 400-meter split was 4:04.34, a personal best for Ledecky in that distance, and would have placed fifth in the individual 400-meter freestyle. At the 750-meter mark, Ledecky was 3.42 seconds ahead of Mireia Belmonte García, and 0.31 seconds under world record pace. Ledecky won by 4.13 seconds and just missed the world record by 0.53 seconds. Her gold was the first international medal of her career, earning her the 2012 Best Female Performance of the Year and Breakout Performer of the Year at the Golden Goggle Awards.