Allyson Felix will run the 400m and not the 200m at the World Track and Field Championships in Beijing in August, according to Reuters.
The last time Felix, 29, did not race the 200m at Worlds was 2001. She captured World titles in 2005, 2007 and 2009.
Felix, also the Olympic 200m champion, qualified for both the 200m and 400m for Worlds but had said repeatedly this spring and summer that she would choose one because the 200m semifinals and 400m final are about one hour apart on Aug. 27.
Felix did run both races at the 2011 Worlds, taking 400m silver (in a personal-best time, beaten by .