2011
Simpson began the 2011 season strong, winning the Mile and 3000 meters championships at the 2011 USA Indoor Track and Field Championships. She qualified for the 2011 World Championships in Athletics by finishing second in the 1500 meters at the US Track and Field Championship.
Simpson won a gold medal at the 1500 meters at the World Championships in a time of 4:05:40. She beat rivals Hannah England and Natalia Rodriguez. Simpson's gold medal was considered a surprise. She became the first American woman to win the event since Mary Decker at the inaugural World Championships in 1983.
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