TOKYO :Melissa Jefferson-Wooden showed no signs of fatigue as she stormed into the women's 200 metres semi-finals at the world championships on Wednesday, three days after winning the 100m gold medal.

Running in the 200m for the first time at a major championships, the 24-year-old American looked in superb form as she easily won her heat in 22.24 seconds to take another step towards the sprint double.

Jamaica's defending champion Shericka Jackson, who is looking to match Allyson Felix's record of three world titles, also looked sharp as she powered home to win the fifth heat in 22.33, the third fastest time of the round.

The top two at last year's Paris Olympics were absent with champion Gabby Thomas missing the championships due to an Achilles injury and silver medallist Julien Alfred

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