Tobi Amusan of Nigeria won her semi-final heat in the 100m hurdles on Wednesday.
She finished with a time of 12.56 seconds ahead of the chasing pack.
Amusan is on her quest to defend her title at the World Athletics Championship in Budapest.
She won her heat yesterday in her first race since she was cleared for doping by the Athletics Integrity Unit.
She clocked 12.48s (0.4) to win the fifth heat ahead of Jamaican Champion Megan Tapper, who came 2nd in 12.51s, and Australian Michelle Jenneke in 12.71s.
Amusan has now qualified for the semi-finals on Wednesday.
Just over a year after smashing the world record in Eugene, Oregon, USA, Amusan has enjoyed a superb run of form, defending her Diamond League title in a record-breaking season that saw her set impressive records.
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