Jamaican sprinter Shelly-Ann Fraser-Pryce has said that she will not defend her 200m title at this year's World Championships.

The 28-year-old claimed victory in the 200m two years ago, four days after winning her second gold medal in the 100m at the Championships.

However, she has now ruled out competing in the event so that she can solely focus her efforts on winning a third 100m gold.

"I won't double in Beijing," Fraser-Pryce told reporters. "I will only do the 100m. It was a decision that was taken by my coach last year that we will opt to do just the 100m this year in order to focus on getting back to where I was in 2008.

"He [Stephen Francis] believed that I strayed a little bit from the 100m in terms of my explosive start and stuff like that so we are now going back to the 100m and bearing in mind that next year is the Olympic Games."

As well as her five gold medals at the World Championships, Fraser-Pryce is a double Olympic champion in the 100m.