Allyson Felix won her record-breaking ninth World Championships gold medal and 11th overall, but first in the 400m, taking the one-lap race in Beijing on Thursday night.
It may set her up for a daunting Rio Olympic double.
At the Bird’s Nest, Felix clocked a personal-best 49.26 seconds to break her tie with Carl Lewis and Michael Johnson for the most Worlds gold medals won by an American. She also broke her tie with Lewis and LaShawn Merritt for the most Worlds medals by an American. She also became the first woman to win World titles in the 200m (she has three) and the 400m.